{ "version": "2026-10-10", "title": "The ClassLock Record: U.S. K-12 active shooter events since Columbine, door by door", "license": { "name": "Creative Commons Attribution 4.0 International (CC BY 4.0)", "url": "https://creativecommons.org/licenses/by/4.0/", "attribution": "ClassLock, The Record (getclasslock.com/record.html)", "note": "Free to copy, republish, adapt and use commercially, provided you credit ClassLock and link to getclasslock.com/record.html. The license covers ClassLock’s compilation, coding and summaries. Material quoted from the cited sources remains under its own terms." }, "scope": "Major U.S. K-12 active shooter events from Columbine (1999) through September 2026 in which the official investigation or best available account allows each death to be placed relative to a classroom door. Attackers are excluded from casualty counts. Virginia Tech (2007) is excluded as higher education. Victim names and attacker names are not recorded.", "confidence_levels": { "primary": "Read directly from an official investigation, commission report, prosecutor's report, sheriff's release, or a peer-reviewed study (ALERRT 2026).", "secondary": "From news reporting or an encyclopedic summary that cites official sources; not independently re-read against the primary document.", "unverified": "Reported but not confirmed by any source we have read; excluded from statistics by default." }, "barriers": { "A": "Not behind any classroom door: hallway, stairwell, lobby, library, cafeteria, bathroom, outdoors, church", "B": "Inside a classroom whose door was unlocked or could not be locked from inside", "C": "Inside a classroom where the attacker was a student of the school", "U": "Inside a classroom the attacker entered, door status not established", "D": "Behind a locked classroom door bypassed by shooting out adjacent glass", "E": "Behind a closed classroom door, shot through the door's glass without entry", "F": "Behind a locked classroom door whose lock was defeated", "X": "Location relative to a door not established" }, "incidents": [ { "id": "columbine-1999", "name": "Columbine High School", "city": "Littleton", "state": "CO", "date": "1999-04-20", "level": "High", "attacker": "Current students (2)", "entry": "Walked in; students of the school", "start": "Outside, west entrance", "weapon": "Shotguns, carbine, handgun", "carried": "In duffel bags", "detector": "Not established", "sro": "Yes, on duty", "lockdown_seconds": null, "duration_min": 49, "killed": 13, "wounded": 20, "doors": [ { "room": "Classrooms generally", "lock_type": "Not established", "state": "Locked or barricaded by occupants", "glass": "Not involved", "outcome": "No locked classroom entered; shots fired into an empty science room" } ], "victims": [ { "outcome": "killed", "count": 13, "location": "Outside the west entrance (2), hallway (1, died in a science room), library (10)", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 20, "location": "Outside, stairs, hallways, library", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "Thirteen people were killed: two outside the west entrance, a teacher shot in the hallway who died in a science room, and ten in the library.", "source": "Wikipedia summary of the Jefferson County Sheriff's report", "url": "https://en.wikipedia.org/wiki/Columbine_High_School_massacre", "confidence": "secondary" }, { "text": "No locked classroom was entered; students in classrooms locked down and barricaded.", "source": "Wikipedia summary", "url": "https://en.wikipedia.org/wiki/Columbine_High_School_massacre", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "heritage-1999", "name": "Heritage High School", "city": "Conyers", "state": "GA", "date": "1999-05-20", "level": "High", "attacker": "Current student (15)", "entry": "Arrived by school bus before classes; entered the commons through the rear door near the bus loop", "start": "Commons area, before school", "weapon": ".22 caliber rifle with the stock sawed off, and a .357 magnum revolver", "carried": "Rifle concealed inside his pants, strapped to his leg; revolver in a book bag, then on his person", "detector": "Not established", "sro": "Assigned school resource officer kept staggered hours and was not on campus; arrived minutes later", "lockdown_seconds": null, "duration_min": 12, "killed": 0, "wounded": 6, "doors": [ { "room": "Rear exterior door to the commons", "lock_type": "Not established", "state": "Not established; it was the rear entrance near where buses unloaded, and other students were approaching it at the same time", "glass": "Not established", "outcome": "Attacker entered through it, fired in the commons, and left through the same doorway" } ], "victims": [ { "outcome": "wounded", "count": 6, "location": "Students in the commons area (125 to 200 present, many seated on the floor)", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student entered the commons area through the rear door and fired 12 shots from the hip throughout the room, emptying the rifle. Eight students were hit; two escaped injury because the bullets lodged in a backpack and a book; six were wounded, one seriously, none fatally.", "source": "National Research Council, Deadly Lessons: Understanding Lethal School Violence (2003), ch. 2, The Incident", "url": "https://nap.nationalacademies.org/read/10370/chapter/5", "confidence": "primary" }, { "text": "Authorities estimated 125 to 200 students were in the common area that morning; he did not single out any one person but shot randomly throughout the room.", "source": "National Research Council, Deadly Lessons (2003), ch. 2", "url": "https://nap.nationalacademies.org/read/10370/chapter/5", "confidence": "primary" }, { "text": "Contested intent: in custody the attacker said he aimed at objects, not people; prosecutors discounted this as self-serving and contended that the intent to inflict harm was present, since he fired low into a room where many students were seated on the floor or on benches.", "source": "National Research Council, Deadly Lessons (2003), ch. 2", "url": "https://nap.nationalacademies.org/read/10370/chapter/5", "confidence": "secondary" }, { "text": "Outside, he fired the revolver at two students chasing him and two more shots toward the building, hitting no one, then was talked into surrendering by two assistant principals. The incident lasted 12 minutes; sheriff's deputies arrived within four minutes of the first call.", "source": "National Research Council, Deadly Lessons (2003), ch. 2 and Table 2-3", "url": "https://nap.nationalacademies.org/read/10370/chapter/5", "confidence": "primary" }, { "text": "Contemporaneous reporting gives the same count: six students injured, one critically. The county commission chairman said the shooting started at 8:03 a.m. in the commons, where hundreds of students usually gathered before class, and ended 12 minutes later.", "source": "CNN, May 20, 1999 (archived)", "url": "https://web.archive.org/web/20000821042923/http://www.cnn.com/US/9905/20/conyers.school.shooting.03/", "confidence": "secondary" } ], "tally": true, "phase": 3 }, { "id": "fort-gibson-1999", "name": "Fort Gibson Middle School", "city": "Fort Gibson", "state": "OK", "date": "1999-12-06", "level": "Middle", "attacker": "Current student (13, seventh grade)", "entry": "Dropped off by car; opened fire outside before entering the building", "start": "Outside the school, where students gathered before classes", "weapon": "9 mm handgun", "carried": "Not established", "detector": "Not established", "sro": "School safety officer on site subdued the attacker (status as a sworn SRO not established)", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 4, "doors": [], "victims": [ { "outcome": "wounded", "count": 4, "location": "Students gathered outside the school before the start of classes", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "Students were gathered outside before the 8 a.m. start of classes when the seventh-grader, shortly after getting out of a car that dropped him off, walked up and opened fire on them (superintendent's account).", "source": "CNN, December 6, 1999 (archived)", "url": "https://web.archive.org/web/20210304192528/http://archives.cnn.com/1999/US/12/06/okla.school.shooting.04/", "confidence": "secondary" }, { "text": "Four students were shot (three boys and a girl, ages 12 and 13); a fifth student had minor injuries (bruises) and was not shot. The Record counts the four gunfire wounds only.", "source": "CNN, December 6, 1999 (archived); KOTV News On 6, December 6, 1999", "url": "https://web.archive.org/web/20210304192528/http://archives.cnn.com/1999/US/12/06/okla.school.shooting.04/", "confidence": "secondary" }, { "text": "A sheriff's deputy said the student emptied the 9 mm handgun and was still trying to pull the trigger when the school's safety officer subdued him; the superintendent said the shooting appeared to be random. Students were brought into the school building.", "source": "KOTV News On 6, December 6, 1999 (KOTV and AP reports)", "url": "https://www.newson6.com/story/5e36862e2f69d76f6209bcba/fort-gibson-middle-school-student-opens-fire-on-classmates-five-injured", "confidence": "secondary" } ], "tally": true, "phase": 3 }, { "id": "santana-2001", "name": "Santana High School", "city": "Santee", "state": "CA", "date": "2001-03-05", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Restroom, then hallway and quadrangle", "weapon": "Handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 2, "wounded": 13, "doors": [], "victims": [ { "outcome": "killed", "count": 2, "location": "Not established; the source does not individually place the two deaths", "barrier": "X", "confidence": "primary" }, { "outcome": "wounded", "count": 13, "location": "Not established; the source gives no complete location breakdown for 11 students and two staff members", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "A current student began firing in a restroom, then moved into the hallway and quadrangle; the report records no access-controlled area encountered.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students died and 13 other people were wounded; the victim-location breakdown is not supplied in this paragraph.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "granite-hills-2001", "name": "Granite Hills High School", "city": "El Cajon", "state": "CA", "date": "2001-03-22", "level": "High", "attacker": "Current student", "entry": "No building entry established; fired from the street", "start": "Street outside the administration building", "weapon": "12-gauge pump-action shotgun and .22-caliber semiautomatic handgun", "carried": "Not established", "detector": "Not established", "sro": "Yes; in the administration building", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 5, "doors": [], "victims": [ { "outcome": "wounded", "count": 5, "location": "Not established; three students and two teachers, without a complete door-relative breakdown", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired from outside toward the administration building windows.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The report records five wounded victims and no victim deaths; a school resource officer returned fire from the administration building.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Hospital officials described pellet injuries to the five victims; additional injuries from falls or glass are excluded.", "source": "ABC News, March 22, 2001", "url": "https://abcnews.com/US/story?id=93750&page=1", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "red-lion-2003", "name": "Red Lion Area Junior High School", "city": "Red Lion", "state": "PA", "date": "2003-04-24", "level": "Junior High", "attacker": "Current student", "entry": "Not established", "start": "Cafeteria", "weapon": "Three handguns: .44-caliber, .357-caliber and .22-caliber", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 0, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Principal in the cafeteria", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The shooting began in the cafeteria before classes.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The principal was killed; no other victim was wounded.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "rocori-2003", "name": "Rocori High School", "city": "Cold Spring", "state": "MN", "date": "2003-09-24", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Basement locker-room exit, then stairs toward the physical education area", "weapon": ".22-caliber handgun", "carried": "Gym bag", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 2, "wounded": 0, "doors": [], "victims": [ { "outcome": "killed", "count": 2, "location": "Locker-room exit and stair/physical education route described for the two students", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student drew a handgun from a gym bag while leaving the basement locker room and shot two students, pursuing one up the stairs.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Both students died; no surviving victim was wounded. A physical education teacher confronted and disarmed the attacker.", "source": "ALERRT 2026, Appendix A, printed p. 61", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "columbia-2004", "name": "Columbia High School", "city": "East Greenbush", "state": "NY", "date": "2004-02-09", "level": "High", "attacker": "Current student", "entry": "Walked past the main office unchallenged", "start": "Second-floor hallway after waiting in a bathroom", "weapon": "12-gauge pump-action shotgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 1, "doors": [], "victims": [ { "outcome": "wounded", "count": 1, "location": "Teacher; exact position relative to a door not established", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The attacker passed the main office, waited in a second-floor bathroom and then fired in the hallway; the report says no access-controlled areas were encountered.", "source": "ALERRT 2026, Appendix A, printed p. 61-62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One teacher was wounded and nobody was killed; an assistant principal subdued the attacker.", "source": "ALERRT 2026, Appendix A, printed p. 61-62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "red-lake-2005", "name": "Red Lake Senior High School", "city": "Red Lake", "state": "MN", "date": "2005-03-21", "level": "High", "attacker": "Current student", "entry": "Shot his way past a metal detector and an unarmed guard at the entrance", "start": "Entrance", "weapon": "Shotgun and two handguns", "carried": "Openly; arrived in a police vehicle", "detector": "Present, staffed by an unarmed guard", "sro": "Unarmed security guard", "lockdown_seconds": null, "duration_min": 10, "killed": 7, "wounded": 7, "doors": [ { "room": "First classroom", "lock_type": "Mechanical lock", "state": "Locked", "glass": "Sidelight shot out; attacker reached through and unlocked the door", "outcome": "Breached through glass" }, { "room": "Second door", "lock_type": "Mechanical lock", "state": "Locked", "glass": "Not involved", "outcome": "Attacker shot at the lock and could not get in" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Security guard at the entrance", "barrier": "A", "confidence": "primary" }, { "outcome": "killed", "count": 6, "location": "Teacher and five students inside the classroom entered through the sidelight", "barrier": "D", "confidence": "primary" }, { "outcome": "wounded", "count": 7, "location": "Seven wounded; placement relative to doors not established in the sources read", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The attacker entered a classroom by breaching the door's sidelight, killed a teacher and several students, and later attempted to breach another door by shooting the lock but was unsuccessful.", "source": "ALERRT 2026, pp. 31, 62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "He shot his way past a metal detector at the entrance, killing an unarmed security guard.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Seven killed at the school (five students, one teacher, one guard) and at least seven wounded.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "campbell-county-2005", "name": "Campbell County Comprehensive High School", "city": "Jacksboro", "state": "TN", "date": "2005-11-08", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Administrative office", "weapon": ".22-caliber handgun", "carried": "Weapon concealed under a napkin when confronted", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 2, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Assistant principal in the administrative office", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 2, "location": "Principal and another assistant principal in the administrative office", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "Administrators confronted the student about a gun in the administrative office, where the shooting occurred.", "source": "ALERRT 2026, Appendix A, printed p. 62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One assistant principal died; the principal and another assistant principal were wounded.", "source": "ALERRT 2026, Appendix A, printed p. 62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "pine-2006", "name": "Pine Middle School", "city": "Reno", "state": "NV", "date": "2006-03-14", "level": "Middle", "attacker": "Current student", "entry": "Not established", "start": "Hallway outside the cafeteria", "weapon": ".38-caliber revolver", "carried": "Backpack", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Not established; the paragraph places the shooting in a hallway but does not separately place both wounded students", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The student brought the revolver in a backpack, loaded it in a bathroom and fired in the hallway outside the cafeteria.", "source": "ALERRT 2026, Appendix A, printed p. 62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students were wounded; no victim died. A physical education teacher persuaded the student to drop the gun.", "source": "ALERRT 2026, Appendix A, printed p. 62", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "essex-2006", "name": "Essex Elementary School", "city": "Essex", "state": "VT", "date": "2006-08-24", "level": "Elementary", "attacker": "Adult outsider; connected to a teacher", "entry": "Entered through an unlocked exterior entrance", "start": "Inside the school; first-shot room not separately established", "weapon": "Handgun; caliber not established", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 1, "doors": [ { "room": "Exterior entrance", "lock_type": "Not established", "state": "Unlocked", "glass": "Not established", "outcome": "Entered" }, { "room": "Classroom containing the two teachers", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Teacher inside a classroom entered by the attacker", "barrier": "U", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Another teacher inside that classroom", "barrier": "U", "confidence": "primary" } ], "facts": [ { "text": "During a staff in-service day in summer break, exterior entrances were unlocked; the intruder entered and shot two teachers in a classroom.", "source": "ALERRT 2026, Appendix A, printed p. 62-63", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One teacher died and another was wounded at the school. Off-campus victims and the attacker are excluded. The report says many classroom doors were unlocked, but does not identify this classroom door as one of them.", "source": "ALERRT 2026, Appendix A, printed p. 62-63", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "orange-2006", "name": "Orange High School", "city": "Hillsborough", "state": "NC", "date": "2006-08-30", "level": "High", "attacker": "Former student", "entry": "No school-building entry established", "start": "Outside the school, near the parking area", "weapon": "Rifle and sawed-off shotgun; explosive devices also carried", "carried": "Not established", "detector": "Not established", "sro": "Yes; school resource officer intervened", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 1, "doors": [], "victims": [ { "outcome": "wounded", "count": 1, "location": "Not established; one student grazed by a bullet, exact door-relative position not given", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The appendix records shooting from outside toward the school and no school victim deaths.", "source": "ALERRT 2026, Appendix A, printed p. 63", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The appellate decision describes a rifle and sawed-off shotgun and shooting at students outside and at the building facade.", "source": "North Carolina Court of Appeals, 2011 decision, facts section", "url": "https://caselaw.findlaw.com/court/nc-court-of-appeals/1574906.html", "confidence": "primary" }, { "text": "Contested weapon description: the appendix lists two shotguns, whereas the appellate decision describes a rifle and a sawed-off shotgun. The weapon field follows the court account.", "source": "Court account compared with ALERRT 2026, p. 63", "url": "https://caselaw.findlaw.com/court/nc-court-of-appeals/1574906.html", "confidence": "secondary" }, { "text": "Only one of the two injured students was wounded by gunfire; the other injury was from broken glass and is excluded from wounded. The off-campus death is excluded.", "source": "Wikipedia incident account", "url": "https://en.wikipedia.org/wiki/2006_Orange_High_School_shooting", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "weston-2006", "name": "Weston High School", "city": "Cazenovia", "state": "WI", "date": "2006-09-29", "level": "High", "attacker": "Current student", "entry": "Entered the main hallway; entrance door status not established", "start": "Main hallway", "weapon": ".22-caliber revolver and shotgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 0, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Principal in the main-hallway confrontation", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The student carried a shotgun and a revolver into the main hallway; a custodian took the shotgun away.", "source": "ALERRT 2026, Appendix A, printed p. 63", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested fatal-weapon account: the appendix attributes the fatal injury to a shotgun discharge, but contemporaneous reporting of the sheriff briefing attributes three shots to the .22-caliber handgun.", "source": "Wisconsin Radio Network, September 29, 2006; compared with ALERRT p. 63", "url": "https://www.wrn.com/update-principal-dies-after-shooting-at-sauk-co-school/", "confidence": "secondary" }, { "text": "The principal was killed and no surviving victim was wounded.", "source": "FBI, Active Shooter Incidents 2000-2018, Weston entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "nickel-mines-2006", "name": "West Nickel Mines School", "city": "Bart Township", "state": "PA", "date": "2006-10-02", "level": "Elementary (one-room)", "attacker": "Adult outsider", "entry": "Walked into the one-room schoolhouse", "start": "Classroom (the only room)", "weapon": "Shotgun, rifle, pistol", "carried": "Openly, from a truck", "detector": "Not established", "sro": "No", "lockdown_seconds": null, "duration_min": 42, "killed": 5, "wounded": 5, "doors": [ { "room": "Schoolhouse door", "lock_type": "None relevant", "state": "Open; attacker barricaded it from inside", "glass": "Not involved", "outcome": "Attacker held the room" } ], "victims": [ { "outcome": "killed", "count": 5, "location": "Inside the single room", "barrier": "B", "confidence": "secondary" }, { "outcome": "wounded", "count": 5, "location": "Inside the single room", "barrier": "B", "confidence": "secondary" } ], "facts": [ { "text": "An adult outsider entered the one-room schoolhouse, ordered the boys and adults out, restrained a group of girls and shot ten of them, killing five.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "A sixth victim died of her injuries in 2024.", "source": "Wikipedia summary", "url": "https://en.wikipedia.org/wiki/West_Nickel_Mines_School_shooting", "confidence": "secondary" }, { "text": "Casualty convention: counts are as of the day of the attack. A sixth victim died of her injuries in 2024 and is not added to the killed count here.", "source": "ClassLock method note", "url": "record.html#method", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "memorial-2006", "name": "Memorial Middle School", "city": "Joplin", "state": "MO", "date": "2006-10-09", "level": "Middle", "attacker": "Current student", "entry": "Entered the school; entrance door status not established", "start": "Inside the school; first-shot room not established", "weapon": "Rifle; FBI also records a handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 0, "doors": [], "victims": [], "facts": [ { "text": "A student fired one rifle shot into the ceiling before the rifle jammed.", "source": "ALERRT 2026, Appendix A, printed p. 63-64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "No victim was killed or wounded.", "source": "ALERRT 2026, Appendix A, printed p. 63-64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI lists a rifle and handgun. Contested exit sequence: the appendix describes flight, whereas FBI describes the principal escorting the student outside.", "source": "FBI Memorial entry compared with ALERRT pp. 63-64", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "successtech-2007", "name": "SuccessTech Academy", "city": "Cleveland", "state": "OH", "date": "2007-10-10", "level": "High", "attacker": "Current student", "entry": "Entered the school; entrance route/status not established", "start": "Fourth-floor hallway", "weapon": "Two revolvers: .22-caliber and .38-caliber", "carried": "Duffel bag (secondary)", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 4, "doors": [], "victims": [ { "outcome": "wounded", "count": 3, "location": "Two students and one teacher in the hallway", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 1, "location": "Teacher inside a classroom described as doorless", "barrier": "C", "confidence": "secondary" } ], "facts": [ { "text": "The student loaded revolvers in a fourth-floor restroom, then began firing in the hallway and moved to classrooms; the appendix describes classrooms without doors.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students and two teachers were wounded; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The incident account places two students and one teacher in the hallway and the other teacher in a classroom. A trampling injury is excluded.", "source": "Wikipedia incident account", "url": "https://en.wikipedia.org/wiki/2007_SuccessTech_Academy_shooting", "confidence": "secondary" }, { "text": "The reference describes an alternative high school and a duffel bag used to carry the weapons.", "source": "Wikipedia school and incident account", "url": "https://en.wikipedia.org/wiki/2007_SuccessTech_Academy_shooting", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "larose-cut-off-2009", "name": "Larose-Cut Off Middle School", "city": "Cut Off", "state": "LA", "date": "2009-05-18", "level": "Middle", "attacker": "Current student", "entry": "Prepared in a restroom and entered a nearby classroom", "start": "Classroom", "weapon": ".25-caliber pistol", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 0, "doors": [ { "room": "Classroom entrance", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered" } ], "victims": [], "facts": [ { "text": "The student entered a classroom after preparing in a restroom and fired over the teacher without hitting a victim.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The attacker injury is excluded; no non-attacker casualty is recorded.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI records zero victim deaths and wounds.", "source": "FBI Larose-Cut Off entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "inskip-2010", "name": "Inskip Elementary School", "city": "Knoxville", "state": "TN", "date": "2010-02-10", "level": "Elementary", "attacker": "Current teacher", "entry": "Left the office and returned with a gun; campus arrival route not established", "start": "Administrative offices", "weapon": "Revolver", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Principal and assistant principal in administrative offices", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The teacher shot two administrators in the offices after students were dismissed early because of snow.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The principal and assistant principal were wounded; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI describes leaving the office and returning with a gun.", "source": "FBI Inskip entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "deer-creek-2010", "name": "Deer Creek Middle School", "city": "Littleton", "state": "CO", "date": "2010-02-23", "level": "Middle", "attacker": "Adult outsider", "entry": "No building entry established", "start": "Parking lot/front area at dismissal", "weapon": ".30-06 bolt-action rifle", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Departing students outside in the parking lot/front area", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired at departing students outside the school.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students were wounded and no victim died; teachers restrained the attacker.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "kelly-2010", "name": "Kelly Elementary School", "city": "Carlsbad", "state": "CA", "date": "2010-10-08", "level": "Elementary", "attacker": "Adult outsider", "entry": "Jumped the perimeter fence", "start": "Playground at lunch", "weapon": ".357 Magnum revolver", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Two second-grade students on the playground", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired at children on the playground during lunch.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two second-grade students were wounded; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 64", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI describes the attacker jumping the school fence.", "source": "FBI Kelly entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "millard-south-2011", "name": "Millard South High School", "city": "Omaha", "state": "NE", "date": "2011-01-05", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Principal office", "weapon": ".40-caliber semiautomatic pistol", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 1, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Assistant principal in the administrative office", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Principal in the administrative office", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The attack occurred in the principal office; the assistant principal was fatally shot.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested surviving wounded count: the appendix lists the principal and a custodian; FBI lists only the principal. The row retains one survivor pending primary evidence of a gunfire injury to the custodian.", "source": "FBI Millard South entry compared with ALERRT p. 65", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" }, { "text": "FBI reports one assistant principal killed and the principal wounded.", "source": "FBI Millard South entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "chardon-2012", "name": "Chardon High School", "city": "Chardon", "state": "OH", "date": "2012-02-27", "level": "High", "attacker": "Student at another school; used this campus for a bus transfer", "entry": "Arrived by bus and waited in the cafeteria for a transfer", "start": "Cafeteria", "weapon": ".22-caliber handgun", "carried": "Backpack", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 3, "wounded": 3, "doors": [], "victims": [ { "outcome": "killed", "count": 3, "location": "Students at the cafeteria table", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 2, "location": "Students in the cafeteria", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Student shot while running in the hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attack began in the cafeteria and included a hallway shot.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Three students died and three others were wounded.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The court describes an alternative-school student changing buses at Chardon and carrying the gun and ammunition in a backpack.", "source": "Ohio Court of Appeals, 2019-Ohio-328, paragraphs 2-3", "url": "https://www.supremecourt.ohio.gov/rod/docs/pdf/11/2019/2019-Ohio-328.pdf", "confidence": "primary" }, { "text": "The court places the three fatal victims and two wounded students in the cafeteria, and the other wounded student in the hallway.", "source": "Ohio Court of Appeals, 2019-Ohio-328, paragraph 3", "url": "https://www.supremecourt.ohio.gov/rod/docs/pdf/11/2019/2019-Ohio-328.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "perry-hall-2012", "name": "Perry Hall High School", "city": "Baltimore County", "state": "MD", "date": "2012-08-27", "level": "High", "attacker": "Current student", "entry": "Student access; exterior entry path not established", "start": "Cafeteria at lunch", "weapon": "Shotgun", "carried": "Bag", "detector": "Not established", "sro": "Yes; assisted in taking the attacker into custody", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 1, "doors": [], "victims": [ { "outcome": "wounded", "count": 1, "location": "Student in the cafeteria", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student brought a shotgun in a bag and began firing in the cafeteria at lunch.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One student was wounded and nobody was killed; staff intervened with help from a school resource officer.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "sandy-hook-2012", "name": "Sandy Hook Elementary School", "city": "Newtown", "state": "CT", "date": "2012-12-14", "level": "Elementary", "attacker": "Adult outsider (former student)", "entry": "Shot through the glass beside the locked front entrance", "start": "Lobby and hallway", "weapon": "Semiautomatic rifle and two handguns", "carried": "Openly, from a car", "detector": "Not established", "sro": "No", "lockdown_seconds": null, "duration_min": 5, "killed": 26, "wounded": 2, "doors": [ { "room": "Front entrance", "lock_type": "Locked glass entrance", "state": "Locked", "glass": "Shot out", "outcome": "Breached through glass" }, { "room": "Room 8", "lock_type": "Keyed from the hallway side only; no inside lock", "state": "Unlocked; substitute teacher had no key", "glass": "Not involved", "outcome": "Entered" }, { "room": "Room 10", "lock_type": "Keyed from the hallway side only; no inside lock", "state": "Unlocked", "glass": "Not involved", "outcome": "Entered" }, { "room": "Room 12", "lock_type": "Keyed from the hallway side only", "state": "Not established; door window covered with paper", "glass": "Covered", "outcome": "Passed by" } ], "victims": [ { "outcome": "killed", "count": 2, "location": "Principal and school psychologist in the hallway", "barrier": "A", "confidence": "primary" }, { "outcome": "killed", "count": 24, "location": "Fifteen children and two adults in Room 8; five children and two adults in Room 10", "barrier": "B", "confidence": "primary" }, { "outcome": "wounded", "count": 2, "location": "Hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The doors in the hallway all locked from the outside with a key; the interior door handles had no locking mechanism. Room 10 could only be locked with a key from the outside and the door was unlocked.", "source": "Connecticut State's Attorney report (2013)", "url": "https://portal.ct.gov/-/media/DCJ/SandyHookFinalReportpdf.pdf", "confidence": "primary" }, { "text": "The Room 8 teacher was a substitute without keys.", "source": "PIX11 reporting", "url": "https://pix11.com/news/teacher-gunned-down-in-newtown-did-not-have-keys-to-lock-her-classroom-door/", "confidence": "secondary" }, { "text": "The attacker shot his way into the locked front entrance by firing through a glass panel next to the doors; 26 killed and at least two wounded.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "taft-union-2013", "name": "Taft Union High School", "city": "Taft", "state": "CA", "date": "2013-01-10", "level": "High", "attacker": "Current student", "entry": "Entered an in-session science classroom", "start": "Science classroom", "weapon": "12-gauge shotgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [ { "room": "Science classroom entrance", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered" } ], "victims": [ { "outcome": "wounded", "count": 2, "location": "Student and teacher in the science classroom", "barrier": "C", "confidence": "primary" } ], "facts": [ { "text": "The student entered an occupied science classroom and fired multiple shots.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "A student and teacher were wounded; a teacher and campus supervisor persuaded the attacker to surrender the weapon.", "source": "ALERRT 2026, Appendix A, printed p. 65", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "sparks-2013", "name": "Sparks Middle School", "city": "Sparks", "state": "NV", "date": "2013-10-21", "level": "Middle", "attacker": "Current student", "entry": "No building entry established", "start": "Outside, basketball courts/playground", "weapon": "9mm semiautomatic handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 2, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Teacher outside near the courts/playground", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 2, "location": "Students outside near the courts/playground", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student fired outside near the courts/playground before the first bell.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students were wounded and an intervening teacher was killed.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "arapahoe-2013", "name": "Arapahoe High School", "city": "Centennial", "state": "CO", "date": "2013-12-13", "level": "High", "attacker": "Current student", "entry": "Entered through an unsecured exterior door described as unlocked/propped open", "start": "Hallway", "weapon": "12-gauge pump-action shotgun; machete and incendiary devices also carried", "carried": "Not established", "detector": "Not established", "sro": "Yes; approached during the incident (FBI)", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 0, "doors": [ { "room": "Exterior entrance", "lock_type": "Not established", "state": "Unsecured; described as unlocked/propped open", "glass": "Not established", "outcome": "Entered" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Student shot in the hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student entered through an unsecured exterior entrance and fatally shot a student in the hallway.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested surviving gunfire-wounded count: ALERRT lists an additional wounded person; FBI lists one killed and zero wounded. This row follows FBI.", "source": "FBI Arapahoe entry compared with ALERRT p. 66", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" }, { "text": "FBI describes movement from hallway to library and an approaching school resource officer.", "source": "FBI Arapahoe entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "berrendo-2014", "name": "Berrendo Middle School", "city": "Roswell", "state": "NM", "date": "2014-01-14", "level": "Middle", "attacker": "Current student", "entry": "Entered the gym; campus entry route not established", "start": "Gymnasium before classes", "weapon": "20-gauge shotgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 3, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Students gathered in the gymnasium", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Adult staff member; door-relative position not established", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired at students gathered in the gymnasium.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students and a staff member were wounded; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI identifies the third wounded person as an unarmed security guard.", "source": "FBI Berrendo entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "reynolds-2014", "name": "Reynolds High School", "city": "Troutdale", "state": "OR", "date": "2014-06-10", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Locker room", "weapon": ".223-caliber semiautomatic rifle; FBI also lists a handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 1, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Student in the locker room", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Teacher in the hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "A student was killed in the locker room, then a teacher was shot in a hallway.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One student died and one teacher was wounded.", "source": "ALERRT 2026, Appendix A, printed p. 66", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI lists a rifle and handgun; no assertion both were used against victims is made.", "source": "FBI Reynolds entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "marysville-2014", "name": "Marysville-Pilchuck High School", "city": "Marysville", "state": "WA", "date": "2014-10-24", "level": "High", "attacker": "Current student", "entry": "Student of the school", "start": "Cafeteria", "weapon": "Semiautomatic handgun", "carried": "Concealed (not detailed)", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": 3, "killed": 4, "wounded": 1, "doors": [], "victims": [ { "outcome": "killed", "count": 4, "location": "Cafeteria table", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 1, "location": "Cafeteria", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The attacker approached a cafeteria table during lunch and fired multiple shots at seated students.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Four students were killed and one wounded; the ALERRT appendix narrative does not itself state the counts.", "source": "Wikipedia summary of Marysville Police and Snohomish County accounts", "url": "https://en.wikipedia.org/wiki/2014_Marysville_Pilchuck_High_School_shooting", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "madison-2016", "name": "Madison Junior/Senior High School", "city": "Middletown", "state": "OH", "date": "2016-02-29", "level": "Junior/Senior High", "attacker": "Current student", "entry": "Not established", "start": "Cafeteria", "weapon": ".380-caliber semiautomatic handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Students in the cafeteria", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student shot two students in the cafeteria.", "source": "ALERRT 2026, Appendix A, printed p. 66-67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The appendix describes two shot students and no victim deaths.", "source": "ALERRT 2026, Appendix A, printed p. 66-67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI lists four injured students, distinguishing two shot from two injured by shrapnel. The latter are excluded.", "source": "FBI Madison entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "antigo-2016", "name": "Antigo High School", "city": "Antigo", "state": "WI", "date": "2016-04-23", "level": "High", "attacker": "Former student", "entry": "Approached outside during prom; no building entry established", "start": "Outside near the office entrance", "weapon": "7.62x39mm semiautomatic rifle", "carried": "Not established", "detector": "Not established", "sro": "Yes; two police officers on the premises, SRO assignment not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Students leaving prom outside the school", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired outside at students leaving prom.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Both wounded students survived; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI records two law enforcement officers already on the premises.", "source": "FBI Antigo entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "townville-2016", "name": "Townville Elementary School", "city": "Townville", "state": "SC", "date": "2016-09-28", "level": "Elementary", "attacker": "Former student (FBI)", "entry": "Drove into a fence near the playground; did not enter the building", "start": "Playground/recess area", "weapon": ".40-caliber pistol", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 3, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Student shot on the playground", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 3, "location": "Two students and a teacher; complete individual door-relative placement not established", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The attacker fired outside near the playground without entering the school; a shot student later died.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested surviving wounded count: the appendix describes three shot people including the later death, implying two survivors; FBI records three surviving wounded at the school. This row retains three.", "source": "FBI Townville entry compared with ALERRT p. 67", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" }, { "text": "The reference describes three students and one teacher shot, one student later dying. The off-campus death is excluded.", "source": "Wikipedia incident narrative", "url": "https://en.wikipedia.org/wiki/2016_Townville_Elementary_School_shooting", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "west-liberty-salem-2017", "name": "West Liberty-Salem High School", "city": "West Liberty", "state": "OH", "date": "2017-01-20", "level": "High", "attacker": "Current student", "entry": "Brought disassembled shotgun in a backpack", "start": "Restroom", "weapon": "12-gauge pump-action shotgun", "carried": "Backpack; weapon disassembled", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [ { "room": "Classroom door 1", "lock_type": "Not established", "state": "Not established", "glass": "Door window fired upon (FBI)", "outcome": "Fired upon; entry not established" }, { "room": "Classroom door 2", "lock_type": "Not established", "state": "Not established", "glass": "Door window fired upon (FBI)", "outcome": "Fired upon; entry not established" } ], "victims": [ { "outcome": "wounded", "count": 1, "location": "Student shot in the restroom", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Student hit by a pellet; door-relative location not established", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The student assembled the shotgun in a restroom, shot a student there and then fired into two classroom doors.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI records two wounded students and gunfire at classroom door windows.", "source": "FBI West Liberty-Salem entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" }, { "text": "Contested injury account: the appendix records one wounded student and no classroom-shot injuries; local reporting describes a second student struck by a pellet. The retained wounded count is two.", "source": "WHIO, April 1, 2017, compared with ALERRT p. 67", "url": "https://www.whio.com/news/local/safety-measures-coming-west-liberty-salem-high-wake-shooting/r0xbxV9nO6v69f6V516b8L/?outputType=amp", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "freeman-2017", "name": "Freeman High School", "city": "Rockford", "state": "WA", "date": "2017-09-13", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Hallway during class change", "weapon": ".223-caliber semiautomatic rifle and .32-caliber pistol", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 3, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Student in the hallway", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 3, "location": "Students in the hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student fired in a hallway during class change.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One student was killed and three others were wounded; a custodian confronted the attacker.", "source": "ALERRT 2026, Appendix A, printed p. 67", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "rancho-tehama-2017", "name": "Rancho Tehama Elementary School", "city": "Rancho Tehama", "state": "CA", "date": "2017-11-14", "level": "Elementary", "attacker": "Adult outsider", "entry": "Drove through a locked gate; did not enter the school building", "start": "Campus exterior; fired toward classroom windows/doors", "weapon": ".223-caliber semiautomatic rifle and .45-caliber pistol", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 1, "doors": [], "victims": [ { "outcome": "wounded", "count": 1, "location": "Student inside a classroom, shot through a window; relation to a classroom door not established", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The attacker drove through a locked gate and fired toward classrooms during lockdown; no victim died at the school and the building was not entered.", "source": "ALERRT 2026, Appendix A, printed p. 67-68", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested gunfire-only count: the appendix lists two wounded school students. FBI separates one gunshot-wounded student from four students injured by shrapnel. This row retains one gunfire-wounded student and excludes off-campus casualties.", "source": "FBI Rancho Tehama entry compared with ALERRT pp. 67-68", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" }, { "text": "Reporting places the shot student inside a classroom, struck through a window; it does not identify a door vision panel.", "source": "TIME, November 16, 2017", "url": "https://time.com/5028119/tehama-california-shooting-teacher/", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "aztec-2017", "name": "Aztec High School", "city": "Aztec", "state": "NM", "date": "2017-12-07", "level": "High", "attacker": "Former student (adult)", "entry": "Entered disguised as a current student", "start": "Second-floor bathroom", "weapon": "Semiautomatic pistol", "carried": "Concealed", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": 12, "killed": 2, "wounded": 0, "doors": [ { "room": "One locked classroom", "lock_type": "Mechanical lock", "state": "Locked", "glass": "Not involved", "outcome": "Attacker shot at the lock and could not get in" }, { "room": "One unlocked classroom", "lock_type": "Not established (ALERRT p. 28 describes a push/pull door with no apparent lock)", "state": "Unlocked", "glass": "Not involved", "outcome": "Entered; no one hit" }, { "room": "Room barricaded with a couch by a substitute", "lock_type": "Barricade", "state": "Barricaded", "glass": "Not involved", "outcome": "Shots fired through the wall; no one hit" } ], "victims": [ { "outcome": "killed", "count": 2, "location": "One in a bathroom, one in a hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker shot through a door lock in an attempt to defeat the lock but was unable to gain entry; the locked door held and he moved on.", "source": "ALERRT 2026, p. 31", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "He killed one student in the restroom and another in the hallway, entered one unlocked classroom, and killed himself inside the school.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "marshall-county-2018", "name": "Marshall County High School", "city": "Benton", "state": "KY", "date": "2018-01-23", "level": "High", "attacker": "Current student", "entry": "Not established", "start": "Commons", "weapon": "Handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 2, "wounded": 14, "doors": [], "victims": [ { "outcome": "killed", "count": 2, "location": "Students in the commons", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 14, "location": "Not established; no complete door-relative location breakdown", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The student began shooting in the school commons.", "source": "ALERRT 2026, Appendix A, printed p. 68", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The appendix records two students killed and 14 wounded.", "source": "ALERRT 2026, Appendix A, printed p. 68", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI lists two killed and 21 injured, including seven non-gunfire injuries; subtracting those seven yields 14 surviving gunfire injuries.", "source": "FBI Marshall County entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "parkland-2018", "name": "Marjory Stoneman Douglas High School", "city": "Parkland", "state": "FL", "date": "2018-02-14", "level": "High", "attacker": "Former student", "entry": "Open, unstaffed pedestrian gate at dismissal, then an unlocked building door", "start": "Stairwell and first-floor hallway of Building 12", "weapon": "Semiautomatic rifle", "carried": "In a rifle bag; assembled in the stairwell", "detector": "Not established", "sro": "Yes; remained outside the building", "lockdown_seconds": null, "duration_min": 6, "killed": 17, "wounded": 17, "doors": [ { "room": "Building 12 exterior door", "lock_type": "Mechanical", "state": "Unlocked", "glass": "Not involved", "outcome": "Entered" }, { "room": "Classrooms fired upon (four on the first floor)", "lock_type": "Keyed from the hallway side", "state": "Not established", "glass": "Door windows shot through", "outcome": "Never entered; six killed and thirteen wounded inside through door glass" }, { "room": "Third-floor teachers' lounge", "lock_type": "Mechanical", "state": "Locked", "glass": "Hurricane-rated exterior windows did not break", "outcome": "Attacker shot his way in; could not fire out of the windows" } ], "victims": [ { "outcome": "killed", "count": 11, "location": "First-floor hallway and stairwell (5); third-floor hallway after the fire alarm (6)", "barrier": "A", "confidence": "primary" }, { "outcome": "killed", "count": 6, "location": "Inside four first-floor classrooms, shot through door windows", "barrier": "E", "confidence": "primary" }, { "outcome": "wounded", "count": 13, "location": "Inside classrooms, through door windows", "barrier": "E", "confidence": "primary" }, { "outcome": "wounded", "count": 4, "location": "Hallways", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The attacker never entered a single classroom in Building 12; all gunshots into classrooms were fired through the classroom door or the window within the door.", "source": "MSD Public Safety Commission report, p. 24", "url": "http://www.fdle.state.fl.us/MSDHS/CommissionReport.pdf", "confidence": "primary" }, { "text": "Classroom locks required a key on the hallway side; only two of thirty classrooms had marked hard corners.", "source": "MSD Public Safety Commission report, pp. 30-32", "url": "http://www.fdle.state.fl.us/MSDHS/CommissionReport.pdf", "confidence": "primary" }, { "text": "He entered through an open, unstaffed gate at dismissal and an unlocked, unmanned building door.", "source": "ABC News on the MSD Commission", "url": "https://abcnews.com/US/security-failures-parkland-school-shooting-included-unlocked-doors/story?id=60056864", "confidence": "secondary" }, { "text": "The lock status of the doors fired on is recorded as unknown.", "source": "ALERRT 2026, footnote 11", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "dixon-2018", "name": "Dixon High School", "city": "Dixon", "state": "IL", "date": "2018-05-16", "level": "High", "attacker": "Former student", "entry": "Entered the school; door state not established", "start": "Near the gym during graduation rehearsal", "weapon": "Rifle; appendix handgun description contested", "carried": "Not established", "detector": "Not established", "sro": "Yes; intervened", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 0, "doors": [], "victims": [], "facts": [ { "text": "The former student fired near the gym during graduation rehearsal; the school resource officer intervened.", "source": "ALERRT 2026, Appendix A, printed p. 68", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "No victim was killed or wounded.", "source": "ALERRT 2026, Appendix A, printed p. 68", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Contested weapon description: ALERRT calls the firearm a 9mm handgun; FBI and the Illinois emergency-management newsletter describe a rifle. The row follows those official accounts.", "source": "FBI Dixon entry compared with ALERRT p. 68", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" }, { "text": "The state school-safety newsletter describes a rifle and an officer stopping the attack near the gym.", "source": "Illinois Emergency Management Agency, June 2018 school-safety newsletter", "url": "https://ready.illinois.gov/content/dam/soi/en/web/ready/plan/documents/newsletter/schoolsafetynewsletterjun2018.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "santa-fe-2018", "name": "Santa Fe High School", "city": "Santa Fe", "state": "TX", "date": "2018-05-18", "level": "High", "attacker": "Current student", "entry": "Student of the school", "start": "Art classroom complex", "weapon": "Short-barreled shotgun and revolver", "carried": "Concealed under a coat", "detector": "Not established", "sro": "Yes", "lockdown_seconds": null, "duration_min": 30, "killed": 10, "wounded": 13, "doors": [ { "room": "Connected art rooms", "lock_type": "Mechanical", "state": "Attacker began inside", "glass": "Door window broken to move between rooms", "outcome": "Moved through connected rooms" }, { "room": "Art storage closet", "lock_type": "Mechanical", "state": "Students barricaded inside", "glass": "Not involved", "outcome": "Attacker shot through the door" } ], "victims": [ { "outcome": "killed", "count": 10, "location": "Art classrooms, closet and connecting rooms", "barrier": "C", "confidence": "secondary" }, { "outcome": "wounded", "count": 13, "location": "Thirteen wounded in and around the art complex; room-by-room placement not available (ALERRT footnote 10)", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The attacker began by firing into an art class in the school's art complex and moved through connected rooms; ten killed and thirteen wounded.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Victim-by-room data are not available.", "source": "ALERRT 2026, footnote 10", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Count conflict: ALERRT lists 13 wounded; the FBI records 12 surviving wounded plus an injured officer.", "source": "ALERRT 2026 Appendix A; FBI Active Shooter Incidents 2000-2018", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-2000-2018.pdf", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "noblesville-west-2018", "name": "Noblesville West Middle School", "city": "Noblesville", "state": "IN", "date": "2018-05-25", "level": "Middle", "attacker": "Current student", "entry": "Left the science classroom and returned armed", "start": "Science classroom", "weapon": "Two handguns", "carried": "Not established", "detector": "Not established", "sro": "Yes; took the attacker into custody", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [ { "room": "Science classroom entrance", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered" } ], "victims": [ { "outcome": "wounded", "count": 2, "location": "Teacher and student in the science classroom", "barrier": "C", "confidence": "primary" } ], "facts": [ { "text": "The student left the science classroom, returned with two handguns and began shooting.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "A teacher and student were wounded; the teacher intervened and a school resource officer took the attacker into custody.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "stem-highlands-ranch-2019", "name": "STEM School Highlands Ranch", "city": "Highlands Ranch", "state": "CO", "date": "2019-05-07", "level": "K-12", "attacker": "Two current students", "entry": "Entered an occupied classroom through two entrances", "start": "Classroom", "weapon": "Handguns", "carried": "Guitar case and backpack", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 1, "wounded": 8, "doors": [ { "room": "Classroom entrance with magnetic strip", "lock_type": "Not established; magnetic strip interfered with latch engagement", "state": "Unsecured with magnetic strip; attacker removed strip and closed/locked door from inside", "glass": "Not established", "outcome": "Entered; later occupants locked attacker out" }, { "room": "Other classroom entrance", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Student confronting an attacker in the classroom", "barrier": "C", "confidence": "primary" }, { "outcome": "wounded", "count": 8, "location": "Not established; full placement of all survivors, including security-officer gunfire victims, is not supplied", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "Two students carried handguns concealed in a guitar case and backpack and entered a classroom through opposite entrances.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "One student confronting an attacker in the classroom died. The appendix counts six wounded by the attackers.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The report describes a magnetic strip keeping one classroom door from latching; the attacker removed it and locked the door. Later occupants locked that attacker out.", "source": "ALERRT 2026, printed pp. 54-55", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI reports one killed and eight wounded, explicitly including two students accidentally shot by a private security officer.", "source": "FBI 2019 report, STEM entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-in-the-us-2019-042820.pdf", "confidence": "primary" }, { "text": "Contested count scope: ALERRT lists six attacker-wounded survivors; FBI lists eight, including two security-officer gunfire victims. This row counts all eight surviving gunfire victims, while their complete door-relative placement remains unestablished.", "source": "FBI 2019 STEM entry compared with ALERRT p. 69", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-in-the-us-2019-042820.pdf", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "saugus-2019", "name": "Saugus High School", "city": "Santa Clarita", "state": "CA", "date": "2019-11-14", "level": "High", "attacker": "Current student", "entry": "Student access; exterior route not established", "start": "Outdoor quadrangle", "weapon": ".45-caliber handgun", "carried": "Backpack", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": 0.26666666666666666, "killed": 2, "wounded": 3, "doors": [], "victims": [ { "outcome": "killed", "count": 2, "location": "Students in the outdoor quadrangle", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 3, "location": "Students in the outdoor quadrangle", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The student removed a handgun from a backpack and fired in the outdoor quadrangle.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two students died and three survived gunfire wounds; the shooting sequence lasted approximately 16 seconds.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "FBI reports two victims killed and three wounded.", "source": "FBI 2019 report, Saugus entry", "url": "https://www.fbi.gov/file-repository/reports-and-publications/active-shooter-incidents-in-the-us-2019-042820.pdf", "confidence": "primary" }, { "text": "The sheriff release distinguishes the attacker from the five other students shot and records two victim deaths.", "source": "Los Angeles County Sheriff, November 14, 2019 release", "url": "https://lasd.org/saugus-high-school-shooting/", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "rigby-2021", "name": "Rigby Middle School", "city": "Rigby", "state": "ID", "date": "2021-05-06", "level": "Middle", "attacker": "Current student", "entry": "Not established", "start": "Hallway, then outside", "weapon": "9mm handgun", "carried": "Backpack (secondary)", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 3, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "School hallway", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 1, "location": "Outside the school", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The student fired in a hallway and then outside; three people were wounded and nobody died.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "A teacher disarmed the student.", "source": "ALERRT 2026, Appendix A, printed p. 69", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Reporting of the sheriff briefing places two gunfire victims in a hallway and one outside and describes the handgun coming from a backpack.", "source": "ABC News, May 6, 2021", "url": "https://abcnews.com/US/sixth-grade-girl-opens-fire-middle-school-idaho/story?id=77543562", "confidence": "secondary" }, { "text": "The official review says most classrooms were secured; one class evacuated from a securable room and was fired upon outside. It does not identify an attacker breach of that classroom.", "source": "Idaho School Safety and Security Program post-incident review, p. 5", "url": "https://schoolsafety.idaho.gov/wp-content/uploads/2021/09/Rigby-MS-Lessons-Learned-Final-Release-Copy.pdf", "confidence": "primary" }, { "text": "The official review describes district SRO and reserve-deputy programs, but does not establish an officer stationed at this school at the first shot.", "source": "Idaho post-incident review, p. 4", "url": "https://schoolsafety.idaho.gov/wp-content/uploads/2021/09/Rigby-MS-Lessons-Learned-Final-Release-Copy.pdf", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "oxford-2021", "name": "Oxford High School", "city": "Oxford Township", "state": "MI", "date": "2021-11-30", "level": "High", "attacker": "Current student", "entry": "Student of the school", "start": "Bathroom, then hallway", "weapon": "Semiautomatic handgun", "carried": "In a backpack", "detector": "Not established", "sro": "Yes", "lockdown_seconds": null, "duration_min": 5, "killed": 4, "wounded": 7, "doors": [ { "room": "Classrooms generally", "lock_type": "Keyed locks plus Nightlock barricades on every door", "state": "Locked", "glass": "Room 215 window beside the door shot through; no one hit", "outcome": "Attacker unable to enter any classroom" }, { "room": "Room 224 office door", "lock_type": "Mechanical", "state": "Closed", "glass": "Shots through the door", "outcome": "Teacher wounded inside" } ], "victims": [ { "outcome": "killed", "count": 4, "location": "Three in the 200 hallway, one in a bathroom", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 6, "location": "Hallway, one while entering a classroom", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Teacher wounded inside her office by shots through the door; whether the rounds passed through glass is not established", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "Due to the quick response by students and staff, the attacker was unable to actually enter any of the classrooms.", "source": "Guidepost Solutions independent investigation, pp. 335-341", "url": "https://schoolshooters.info/sites/default/files/FINAL-REPORT-OCS-Investigation.pdf", "confidence": "primary" }, { "text": "He fired into Room 215 through the window glass beside the door, hitting no one, and three shots through Room 224's door, wounding a teacher in her office.", "source": "Guidepost Solutions independent investigation", "url": "https://schoolshooters.info/sites/default/files/FINAL-REPORT-OCS-Investigation.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "edmund-burke-2022", "name": "Edmund Burke School", "city": "Washington", "state": "DC", "date": "2022-04-22", "level": "Middle/High", "attacker": "Adult outsider", "entry": "No school entry; fired from an apartment across the street", "start": "Fifth-floor apartment overlooking the school", "weapon": "Rifles and handgun; a rifle fired from a tripod", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 4, "doors": [], "victims": [ { "outcome": "wounded", "count": 1, "location": "Student in the elevated glass bridge", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 1, "location": "Adult in a vehicle at school pickup", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 2, "location": "Not established; remaining two adults, including one graze victim", "barrier": "X", "confidence": "primary" } ], "facts": [ { "text": "The attacker fired from a fifth-floor apartment across from the school using a rifle on a tripod.", "source": "ALERRT 2026, Appendix A, printed p. 70", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Four victims were wounded; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 70", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "MPD confirms four wounded victims, including a fourth who reported a graze injury.", "source": "Metropolitan Police Department incident release", "url": "https://mpdc.dc.gov/release/deceased-suspect-identified-2900-block-van-ness-street-northwest", "confidence": "primary" }, { "text": "The follow-up account places a student in the elevated glass bridge and an adult in a vehicle at pickup; it does not provide precise door-relative positions for the other two adults.", "source": "WTOP, May 12, 2022", "url": "https://wtop.com/dc/2022/05/weeks-after-van-ness-shooting-unprecedented-look-into-investigation-but-still-no-answer-to-why/", "confidence": "secondary" } ], "tally": true, "phase": 2 }, { "id": "uvalde-2022", "name": "Robb Elementary School", "city": "Uvalde", "state": "TX", "date": "2022-05-24", "level": "Elementary", "attacker": "Former student (adult)", "entry": "Unlocked west exterior door (propped earlier; closed but did not lock)", "start": "Hallway of the west building", "weapon": "Semiautomatic rifle", "carried": "Openly, from a crashed vehicle", "detector": "Not established", "sro": "District police chief on campus without a radio", "lockdown_seconds": null, "duration_min": 77, "killed": 21, "wounded": 17, "doors": [ { "room": "West exterior door", "lock_type": "Mechanical", "state": "Propped with a rock earlier; closed by a teacher but did not lock", "glass": "Not involved", "outcome": "Entered" }, { "room": "Room 111", "lock_type": "Keyed from the hallway side; lock reported faulty months earlier, never repaired", "state": "Unlocked (probably never engaged)", "glass": "Not involved", "outcome": "Entered" }, { "room": "Room 112", "lock_type": "Keyed from the hallway side", "state": "Connected to 111 by an unlocked interior door", "glass": "Not involved", "outcome": "Entered" } ], "victims": [ { "outcome": "killed", "count": 21, "location": "Nineteen children and two teachers inside rooms 111 and 112", "barrier": "B", "confidence": "primary" }, { "outcome": "wounded", "count": 17, "location": "Seventeen wounded, most inside rooms 111 and 112; complete placement of every survivor not established in the sources read", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "All of the exterior doors and at least eight interior doors of the west building were unlocked; the district had a culture of complacency regarding locked-door policies.", "source": "U.S. Department of Justice Critical Incident Review, Executive Summary, Observation 8", "url": "https://portal.cops.usdoj.gov/resourcecenter/content.ashx/cops-r1143-pub.pdf", "confidence": "primary" }, { "text": "Room 111's lock was widely known to be faulty, yet it was not repaired; teachers propped doors with rocks and used magnets to defeat latches.", "source": "Texas House Investigative Committee interim report (July 2022)", "url": "https://house.texas.gov/media/pdf/committees/reports/87interim/Robb-Elementary-Shooting-Report-070722.pdf", "confidence": "primary" }, { "text": "The lock on the door to room 111 was never engaged; officers waited for a key to a door that was never locked.", "source": "ALERRT 2026", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "cvpa-2022", "name": "Central Visual and Performing Arts High School", "city": "St. Louis", "state": "MO", "date": "2022-10-24", "level": "High", "attacker": "Former student (adult)", "entry": "Shot out the window portion of a locked side door, reached inside and unlocked it", "start": "Annex hallway near the dance studio, then the third floor", "weapon": "Semiautomatic rifle", "carried": "Openly", "detector": "Not established", "sro": "Security staff present", "lockdown_seconds": null, "duration_min": 17, "killed": 2, "wounded": 4, "doors": [ { "room": "Exterior side door (Arsenal Street)", "lock_type": "Locked door with a glass panel", "state": "Locked", "glass": "Window portion shot out; attacker reached inside and unlocked the door", "outcome": "Breached through glass" }, { "room": "Dance studio", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered; one shot fired toward students, no one inside injured" }, { "room": "Room 215", "lock_type": "Not established", "state": "Not established", "glass": "Rounds fired into the room from the hallway", "outcome": "Not entered" }, { "room": "Room 323 (health class)", "lock_type": "Not established", "state": "Not described in the released police report (student statements redacted); ALERRT records a locked classroom door at this school breached through its vision light", "glass": "Not described in the report", "outcome": "Entered; teacher killed" }, { "room": "Room 307 (computer lab, where the attacker barricaded himself)", "lock_type": "Double door with a deadbolt", "state": "Locked", "glass": "Officers fired through the door window", "outcome": "Police shot the deadbolt; it was not disabled. Entry made after the door was pulled open" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Student shot in the hallway as she left the dance hall; found in a Collegiate hallway", "barrier": "A", "confidence": "primary" }, { "outcome": "killed", "count": 1, "location": "Teacher inside Room 323", "barrier": "D", "confidence": "secondary" }, { "outcome": "wounded", "count": 4, "location": "Four wounded; placement relative to doors not established in the sources read", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The attacker shot out the window portion of a locked side door, reached inside, unlocked the door and entered the school.", "source": "SLMPD Incident Report 22050676 (released October 2024), p. 312 (security officer statement)", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "primary" }, { "text": "Surveillance shows the student exiting the dance hall, encountering the attacker, who fires a shot at her; he then continues into the dance hall. The dance teacher said he fired one shot toward students in the studio and no one there was injured. The student was found in a Collegiate hallway.", "source": "SLMPD Incident Report 22050676 (released October 2024), pp. 299, 327, 346-347", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "primary" }, { "text": "In Room 323 the narrative says only that he encountered numerous students and a teacher and opened fire, fatally wounding the teacher. The scene description of Room 323 records wall damage, blood and ballistic evidence and does not describe damage to the door, its lock or its glass. Student statements from the room are redacted as juvenile records.", "source": "SLMPD Incident Report 22050676 (released October 2024), pp. 307, 319, 449", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "primary" }, { "text": "ALERRT records a second locked classroom door at this school breached by reaching through its vision light, and states that no lock in its dataset was defeated mechanically. It does not name the room; press accounts of student statements (the attacker shot at the door, unlocked it and stepped in) are consistent with Room 323.", "source": "ALERRT 2026, p. 30; St. Louis Public Radio on the SLMPD report", "url": "https://www.stlpr.org/law-order/2024-10-29/st-louis-central-visual-performing-arts-shooting-police-report", "confidence": "secondary" }, { "text": "Press and encyclopedic summaries say the Room 323 lock was shot open or shot and damaged. No such statement appears in the released police report; the only locks the report describes being shot are those police fired on.", "source": "ClassLock reading of SLMPD Incident Report 22050676 (released October 2024), 2026-10-09", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "unverified" }, { "text": "At Room 307, where the attacker barricaded himself, police shot the deadbolt to get in: the deadbolt was not successfully damaged and the lock was not disabled after being shot; officers got in after the door was pulled open.", "source": "SLMPD Incident Report 22050676 (released October 2024), pp. 377, 380-381", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "primary" }, { "text": "Two killed (a student and a teacher); five students treated for wounds at a children’s hospital and three for injuries from jumping out of a window. The Record counts four gunfire-wounded per ALERRT.", "source": "SLMPD Incident Report 22050676 (released October 2024), p. 299; ALERRT 2026 Appendix A", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report", "confidence": "secondary" } ], "tally": true, "sources_note": { "title": "Sources for this incident", "text": "The primary source is the St. Louis Metropolitan Police Department investigative report, Incident Report 22050676: 432 pages, released in October 2024 under Missouri’s Sunshine Law. Juvenile records and personal identifying information are redacted, including the statements of the students in Room 323. The page numbers in the facts below refer to that report. Because the report names victims, witnesses and officers, ClassLock links to a public copy rather than hosting it. The ALERRT Center’s 2026 study (p. 30) is the second source for the door account.", "links": [ { "label": "SLMPD investigative report (public copy on Scribd; login required to download)", "url": "https://www.scribd.com/document/785311033/CVPA-High-School-Shooting-SLMPD-Investigative-Report" }, { "label": "St. Louis Public Radio on the report’s release", "url": "https://www.stlpr.org/law-order/2024-10-29/st-louis-central-visual-performing-arts-shooting-police-report" }, { "label": "ALERRT Center 2026 study", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf" } ] }, "phase": 1 }, { "id": "covenant-2023", "name": "The Covenant School", "city": "Nashville", "state": "TN", "date": "2023-03-27", "level": "Elementary (private)", "attacker": "Former student (adult)", "entry": "Shot out the glass of two sets of locked exterior doors", "start": "Entrance, then hallways", "weapon": "Two semiautomatic rifles and a pistol", "carried": "Openly, from a vehicle", "detector": "None", "sro": "No", "lockdown_seconds": null, "duration_min": 14, "killed": 6, "wounded": 0, "doors": [ { "room": "Exterior entrance doors", "lock_type": "Locked glass doors", "state": "Locked", "glass": "Shot out; attacker crawled through", "outcome": "Breached through glass" }, { "room": "Two third-grade classrooms", "lock_type": "Mechanical, with blackout curtains and security bars", "state": "Locked", "glass": "Door windows shattered by gunfire; no one hit", "outcome": "Not entered; attacker moved on" }, { "room": "Rooms searched", "lock_type": "Mechanical", "state": "Unlocked and unoccupied", "glass": "Not involved", "outcome": "Entered, empty" } ], "victims": [ { "outcome": "killed", "count": 6, "location": "Custodian shot through an interior window from the hallway; three children and a substitute teacher at the top of a stairwell; head of school in a hallway", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker emptied two magazines through two third-grade classroom doors, then walked down the hallway without making any attempt to further breach those rooms; the rooms she searched were unlocked and unoccupied.", "source": "Metropolitan Nashville Police Department investigative case summary (April 2025), pp. 2-7", "url": "https://www.nashville.gov/sites/default/files/2025-04/Covenant_Final_Summary.pdf", "confidence": "primary" }, { "text": "No weapons-detection technology was present; the attacker entered by shooting through locked glass exterior doors.", "source": "ABC News", "url": "https://abcnews.com/US/nashville-shooting-shows-school-doors-security-weakness-expert/story?id=98178022", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "perry-2024", "name": "Perry High School", "city": "Perry", "state": "IA", "date": "2024-01-04", "level": "High", "attacker": "Current student", "entry": "Student of the school; waited in a restroom about 20 minutes", "start": "Hallway, then commons", "weapon": "Pump-action shotgun and a handgun", "carried": "Concealed (bag)", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 2, "wounded": 6, "doors": [ { "room": "Occupied classrooms", "lock_type": "Mechanical", "state": "Locked", "glass": "Not involved", "outcome": "Attacker shot a door and tried the handle; it held" } ], "victims": [ { "outcome": "killed", "count": 2, "location": "Cafeteria and commons before school, including the principal", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 6, "location": "Cafeteria and commons", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The attacker shot the door and then tried the handle of a locked door; the locked door held and he moved on.", "source": "ALERRT 2026, p. 31", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "He opened fire in a hallway, moved to a commons area where students were gathered, killed two and wounded four others, and was unable to break into occupied classrooms.", "source": "ALERRT 2026, Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Six people were hit in the first 24 seconds; six wounded in total.", "source": "Wikipedia summary", "url": "https://en.wikipedia.org/wiki/2024_Perry_High_School_shooting", "confidence": "secondary" }, { "text": "Count conflict: the ALERRT appendix says four wounded; press summaries say six injured. The Record keeps six pending the official account.", "source": "ALERRT 2026 Appendix A; Wikipedia summary", "url": "https://en.wikipedia.org/wiki/2024_Perry_High_School_shooting", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "apalachee-2024", "name": "Apalachee High School", "city": "Winder", "state": "GA", "date": "2024-09-04", "level": "High", "attacker": "Current student", "entry": "Student of the school; left class and prepared in a restroom", "start": "Hallway outside his own classroom", "weapon": "Semiautomatic rifle", "carried": "Reported concealed in a backpack", "detector": "Not established", "sro": "Yes (two); attacker surrendered to them", "lockdown_seconds": null, "duration_min": 6, "killed": 4, "wounded": 9, "doors": [ { "room": "Attacker's own classroom", "lock_type": "Self-locking on close", "state": "Locked", "glass": "Student saw the rifle through the door glass and did not open", "outcome": "Attacker denied re-entry" }, { "room": "Nearby classroom", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Entered; 10-15 rounds fired" }, { "room": "Other classrooms with closed doors", "lock_type": "Not established", "state": "Closed", "glass": "Not involved", "outcome": "No attempt to enter" } ], "victims": [ { "outcome": "killed", "count": 1, "location": "Teacher shot at his own doorway, in the hallway", "barrier": "A", "confidence": "secondary" }, { "outcome": "killed", "count": 3, "location": "Inside the classroom the attacker entered", "barrier": "U", "confidence": "secondary" }, { "outcome": "wounded", "count": 9, "location": "Classroom and hallway (seven by gunfire)", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "The classroom door had automatically locked when it was closed, denying the perpetrator re-entry; he opened fire in the hallway and moved down the corridor firing at classroom doors.", "source": "ALERRT 2026, p. 17 and Appendix A", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "A student saw the rifle through the door glass and did not open the door.", "source": "Wikipedia summary of GBI and press accounts", "url": "https://en.wikipedia.org/wiki/2024_Apalachee_High_School_shooting", "confidence": "secondary" }, { "text": "A teacher opened his own door to investigate and was shot in the hallway.", "source": "ABC7 reporting", "url": "https://abc7news.com/post/apalachee-teacher-fatally-shot-classroom-doorway-he-was-trying-crawl-back-us/15271998/", "confidence": "secondary" }, { "text": "The status of the door of the classroom the attacker entered is not established in the sources reviewed.", "source": "ClassLock research note", "url": "evidence.html#incidents", "confidence": "unverified" } ], "tally": true, "phase": 1 }, { "id": "feather-river-2024", "name": "Feather River Adventist School", "city": "Oroville", "state": "CA", "date": "2024-12-04", "level": "K-8", "attacker": "Adult outsider", "entry": "Admitted for an arranged enrollment tour using a false pretext", "start": "Playground outside the school", "weapon": "9mm handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 2, "doors": [], "victims": [ { "outcome": "wounded", "count": 2, "location": "Two kindergarten students on the playground", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attacker obtained a school tour under a false enrollment pretext before shooting outside.", "source": "ALERRT 2026, Appendix A, printed p. 71", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "Two kindergarten students were wounded on the playground; no victim died.", "source": "ALERRT 2026, Appendix A, printed p. 71", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The sheriff presentation describes the arranged tour and false enrollment pretext and confirms gunshot injuries to two children aged five and six.", "source": "Butte County Sheriff, December 5, 2024 press-conference presentation, pp. 5-6 and 11", "url": "https://www.buttecounty.net/DocumentCenter/View/14481/Powerpoint-12-5-24-press-conference", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "abundant-life-2024", "name": "Abundant Life Christian School", "city": "Madison", "state": "WI", "date": "2024-12-16", "level": "K-12 (private)", "attacker": "Current student", "entry": "Student of the school", "start": "Classroom used as a mixed-grade study hall", "weapon": "Two pistols", "carried": "Not established", "detector": "Not established", "sro": "No", "lockdown_seconds": null, "duration_min": 8, "killed": 2, "wounded": 6, "doors": [ { "room": "Study hall classroom", "lock_type": "Not established", "state": "Not established; attacker was a student at the school", "glass": "Not established", "outcome": "Whether she was already in the room or entered it is not established" } ], "victims": [ { "outcome": "killed", "count": 2, "location": "Inside the study hall", "barrier": "C", "confidence": "secondary" }, { "outcome": "wounded", "count": 6, "location": "Inside the study hall", "barrier": "C", "confidence": "secondary" } ], "facts": [ { "text": "The shooting occurred inside a classroom being used as a mixed-grade study hall; two killed and five wounded by gunfire, with a sixth injured.", "source": "ALERRT 2026, Appendix A; Madison Police timeline via Wikipedia", "url": "https://en.wikipedia.org/wiki/Abundant_Life_Christian_School_shooting", "confidence": "secondary" }, { "text": "Official accounts do not say whether the attacker was already seated in the room or walked in immediately before firing.", "source": "ClassLock research note, checked 2026-10-05", "url": "evidence.html#incidents", "confidence": "unverified" } ], "tally": true, "phase": 1 }, { "id": "antioch-2025", "name": "Antioch High School", "city": "Nashville", "state": "TN", "date": "2025-01-22", "level": "High", "attacker": "Current student", "entry": "Arrived by school bus", "start": "Cafeteria", "weapon": "Handgun", "carried": "Concealed", "detector": "AI gun-detection cameras present; did not alert (shooter outside effective view). No metal detectors.", "sro": "Yes (two), not in the cafeteria", "lockdown_seconds": null, "duration_min": 1, "killed": 1, "wounded": 1, "doors": [], "victims": [ { "outcome": "killed", "count": 1, "location": "Cafeteria", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 1, "location": "Cafeteria (one more injured in a fall)", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "Ten shots were fired in 17 seconds in the cafeteria; the school had no metal detectors and two SROs were elsewhere in the building.", "source": "Wikipedia summary", "url": "https://en.wikipedia.org/wiki/2025_Antioch_High_School_shooting", "confidence": "secondary" }, { "text": "The camera-based AI gun-detection system did not alert; the district said the shooter was not close enough to the cameras for an accurate read.", "source": "NBC News", "url": "https://www.nbcnews.com/news/us-news/ai-weapon-detection-system-antioch-high-school-failed-detect-gun-nashv-rcna189025", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "annunciation-2025", "name": "Annunciation Catholic School", "city": "Minneapolis", "state": "MN", "date": "2025-08-27", "level": "Elementary (private)", "attacker": "Former student (adult)", "entry": "Never entered; fired through church windows from outside", "start": "Outside the church during school Mass", "weapon": "Rifle, shotgun and pistol (reported)", "carried": "Openly, outside", "detector": "Not established", "sro": "No", "lockdown_seconds": null, "duration_min": null, "killed": 2, "wounded": 27, "doors": [ { "room": "Church exits", "lock_type": "n/a", "state": "Barricaded from outside by the attacker", "glass": "Stained-glass windows fired through", "outcome": "Attacker never entered" } ], "victims": [ { "outcome": "killed", "count": 2, "location": "Church pews", "barrier": "A", "confidence": "secondary" }, { "outcome": "wounded", "count": 27, "location": "Church pews", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "The attacker fired through the church's stained-glass windows during a school Mass and barricaded exits from outside; two children killed and 27 wounded by gunfire.", "source": "Wikipedia summary of Minneapolis Police accounts", "url": "https://en.wikipedia.org/wiki/Annunciation_Catholic_Church_shooting", "confidence": "secondary" }, { "text": "Count conflict: the FBI’s 2025 active shooter report lists 2 killed and 28 wounded and classes the attack as a house-of-worship incident; the Record keeps 27 gunfire-wounded from the police account.", "source": "FBI, Active Shooter Incidents in the United States in 2025", "url": "https://www.fbi.gov/news/press-releases/fbi-releases-2025-active-shooter-incidents-in-the-united-states-report", "confidence": "secondary" } ], "tally": true, "phase": 1 }, { "id": "evergreen-2025", "name": "Evergreen High School", "city": "Evergreen", "state": "CO", "date": "2025-09-10", "level": "High", "attacker": "Current student", "entry": "Student of the school", "start": "Inside and outside the building", "weapon": "Revolver", "carried": "Concealed", "detector": "Not established", "sro": "Not established", "lockdown_seconds": 42, "duration_min": 9, "killed": 0, "wounded": 2, "doors": [ { "room": "Security doors and classroom doors", "lock_type": "Mechanical and security doors", "state": "Locked within 42 seconds of the first shot", "glass": "Not involved", "outcome": "Attacker tried several doors for about three minutes and could not get back in" } ], "victims": [ { "outcome": "wounded", "count": 1, "location": "Inside the building", "barrier": "A", "confidence": "primary" }, { "outcome": "wounded", "count": 1, "location": "Outside, across the field", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "Lockdown was initiated 42 seconds after the first shot; the attacker spent nearly three minutes unsuccessfully attempting to re-enter the building before abandoning the effort.", "source": "ALERRT 2026, pp. 44-46", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The sheriff said many more people could have been hurt if not for safety measures such as locked doors.", "source": "Jefferson County Sheriff's Office", "url": "https://www.jeffco.us/m/newsflash/Home/Detail/2472", "confidence": "primary" } ], "tally": true, "phase": 1 }, { "id": "sl-mason-2025", "name": "S.L. Mason Elementary School", "city": "Valdosta", "state": "GA", "date": "2025-09-25", "level": "Elementary", "attacker": "Adult outsider", "entry": "Entered campus; school-building entry not established", "start": "Pickup line outside the school", "weapon": "Handgun", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 0, "doors": [], "victims": [], "facts": [ { "text": "The attacker approached the school and fired toward vehicles in the pickup line.", "source": "ALERRT 2026, Appendix A, printed p. 71", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "No victim was killed or wounded.", "source": "ALERRT 2026, Appendix A, printed p. 71", "url": "https://alerrtresearch.org/resources/reports/report_2026_sia_locked_doors.pdf", "confidence": "primary" }, { "text": "The responding officer observed the armed person entering campus. GBI reports immediate lockdown, a vehicle hit by gunfire and no victim injuries.", "source": "Georgia Bureau of Investigation, September 26, 2025 incident release", "url": "https://gbi.georgia.gov/press-releases/2025-09-26/gbi-investigates-officer-involved-shooting-valdosta-ga", "confidence": "primary" } ], "tally": true, "phase": 2 }, { "id": "pauls-valley-2026", "name": "Pauls Valley High School", "city": "Pauls Valley", "state": "OK", "date": "2026-04-07", "level": "High", "attacker": "Former student (20)", "entry": "Walked into the school foyer with a gun during the school day; how the entrance was opened is not established", "start": "School lobby (foyer)", "weapon": "Handgun (pistol)", "carried": "Not established", "detector": "Not established", "sro": "Not established; the principal and other staff confronted and disarmed him before police arrived", "lockdown_seconds": null, "duration_min": null, "killed": 0, "wounded": 1, "doors": [ { "room": "School entrance to the lobby", "lock_type": "Not established", "state": "Not established", "glass": "Not established", "outcome": "Attacker gained entry; method not described in sources read" } ], "victims": [ { "outcome": "wounded", "count": 1, "location": "Principal, shot in the leg in the lobby while tackling the attacker", "barrier": "A", "confidence": "secondary" } ], "facts": [ { "text": "OSBI release as reproduced by KOAM: officers responded at about 2:21 p.m. and found the principal with a gunshot wound; the suspect, a 20-year-old former student, had gained entry into the school, and the principal tackled him in the school foyer.", "source": "Oklahoma State Bureau of Investigation release, reproduced by KOAM News Now, April 7, 2026", "url": "https://www.koamnewsnow.com/news/joplin-news-first/osbi-investigate-pauls-valley-school-shooting/article_f28b0250-dfb8-429c-a896-151722ac4de0.html", "confidence": "secondary" }, { "text": "School video released under an open records request shows the gunman enter, point a handgun at two students in the lobby and fire; the principal rushed him, tackled and disarmed him while the students ran away.", "source": "Associated Press via Boston.com, April 15, 2026", "url": "https://www.boston.com/news/crime/2026/04/15/watch-dramatic-video-shows-oklahoma-high-school-principal-tackle-disarm-gunman-as-students-flee/", "confidence": "secondary" }, { "text": "According to an OSBI affidavit described by AP, the man told investigators he went to the school planning to kill students, the principal and then himself in a mass shooting; he was charged with shooting with intent to kill and pointing a firearm.", "source": "Associated Press via Boston.com, April 15, 2026", "url": "https://www.boston.com/news/crime/2026/04/15/watch-dramatic-video-shows-oklahoma-high-school-principal-tackle-disarm-gunman-as-students-flee/", "confidence": "secondary" }, { "text": "An OSBI spokesman said the subject fired multiple rounds; the principal was hurt but no one else was, and no students were injured.", "source": "ABC7 / Associated Press, April 8, 2026", "url": "https://abc7news.com/post/high-school-principal-shot-leg-confronting-man-gun-oklahoma-sheriff-says/18856272/", "confidence": "secondary" } ], "tally": true, "phase": 3 }, { "id": "islamic-center-sd-2026", "name": "Islamic Center of San Diego (Bright Horizon Academy lower campus)", "city": "San Diego", "state": "CA", "date": "2026-05-18", "level": "Elementary (pre-K to grade 3 campus of a pre-K to 12 school)", "attacker": "Two outsiders (ages 17 and 18), not students of the school", "entry": "Parked in the center's lot, ran past the armed security guard, then entered the building after killing him; door not identified", "start": "Parking lot outside the mosque, during the school day", "weapon": "Rifle and handgun (models not confirmed by authorities)", "carried": "Not established", "detector": "Not established", "sro": "No SRO established; an armed security guard on site exchanged fire with the attackers and was killed", "lockdown_seconds": null, "duration_min": null, "killed": 3, "wounded": 0, "doors": [ { "room": "Islamic Center building (houses the school's lower campus)", "lock_type": "Not established", "state": "Not established; the guard initiated lockdown by radio before he was killed", "glass": "Not established", "outcome": "Attackers entered, accessed a few empty areas and rooms, and left through a door to the parking lot; no children or staff inside were injured" } ], "victims": [ { "outcome": "killed", "count": 3, "location": "Adults outside the building in the parking lot: the security guard and two community members who came to help", "barrier": "A", "confidence": "primary" } ], "facts": [ { "text": "The attackers parked in the center's lot and ran past the security guard, who exchanged gunfire with them and initiated lockdown protocols for the center by radio before he was killed. Police say his actions delayed and deterred access to the greater area of the facility.", "source": "San Diego Police Department, Islamic Center Shooting Information page", "url": "https://www.sandiego.gov/police/news-center/news-releases/islamic-center-shooting-information", "confidence": "primary" }, { "text": "The attackers then entered the building, accessed a few empty areas and rooms, and exited through a door back into the parking lot, where they shot and killed two men. Officers found three deceased adult victims outside the center, deployed into the Islamic Center and adjacent school, and reported that no children from the school or officers were injured.", "source": "San Diego Police Department, Islamic Center Shooting Information page", "url": "https://www.sandiego.gov/police/news-center/news-releases/islamic-center-shooting-information", "confidence": "primary" }, { "text": "Police received the first calls of shots fired at the center at 11:42 a.m. and the first officers arrived at 11:46 a.m. A landscaper a few blocks away was then shot at; his helmet was struck and he suffered minor injuries. That off-campus injury is not counted in this row, following the Record's school-only convention.", "source": "San Diego Police Department, Preliminary Timeline (as of May 22, 2026)", "url": "https://www.sandiego.gov/sites/default/files/2026-05/20260522-islamic-center-shooting-preliminary-timeline.pdf", "confidence": "primary" }, { "text": "The Islamic Center houses the lower campus (pre-K to third grade) of Bright Horizon Academy, a pre-K to 12th grade school. Citing The Washington Post, the article says teachers and 140 students were inside the building and that the guard's lockdown call likely bought them time to hide.", "source": "Wikipedia, 2026 Islamic Center of San Diego shooting", "url": "https://en.wikipedia.org/wiki/2026_Islamic_Center_of_San_Diego_shooting", "confidence": "secondary" }, { "text": "Conflict: KPBS reports the attackers never made it beyond the lobby, where about 100 schoolchildren and staff were inside; SDPD says they accessed a few empty areas and rooms. KPBS also reports, from the attackers' livestream, that one used a rifle that jammed before he drew a handgun. The Record follows SDPD on movement.", "source": "KPBS, May 28, 2026", "url": "https://www.kpbs.org/news/public-safety/2026/05/28/did-californias-assault-weapons-ban-save-lives-in-san-diego-mosque-attack", "confidence": "secondary" }, { "text": "Classification note: the attack targeted the mosque and is investigated as a hate crime; the FBI may classify it as a house of worship incident. It is included because it occurred on the property of a K-12 school campus during school hours, the attackers entered the building that held the students, and Education Week counts it as a K-12 school shooting. One attacker was wounded by the guard; attackers are not counted.", "source": "SDPD Islamic Center Shooting Information page; Education Week 2026 school shooting tracker", "url": "https://www.edweek.org/leadership/school-shootings-this-year-how-many-and-where/2026/01", "confidence": "secondary" } ], "tally": true, "phase": 3 }, { "id": "westwood-hills-2026", "name": "Westwood Hills Elementary School", "city": "Waynesboro", "state": "VA", "date": "2026-09-02", "level": "Elementary", "attacker": "Adult outsider", "entry": "Forced his way into the school (method not detailed)", "start": "Entrance", "weapon": "Firearm (not detailed)", "carried": "Not established", "detector": "Not established", "sro": "Not established", "lockdown_seconds": null, "duration_min": 3, "killed": 0, "wounded": 1, "doors": [ { "room": "Library", "lock_type": "Not established", "state": "Not established; no students present", "glass": "Not established", "outcome": "Attacker died there" } ], "victims": [ { "outcome": "wounded", "count": 1, "location": "Staff member", "barrier": "X", "confidence": "secondary" } ], "facts": [ { "text": "An armed adult forced his way into the school, wounded a staff member and died in the library, where no students were present; police were on scene in about three minutes.", "source": "VPM and WDBJ7 reporting", "url": "https://www.vpm.org/news/2026-09-03/waynesboro-westwood-hills-elementary-school-shooting-vsp-spanberger/", "confidence": "secondary" } ], "tally": true, "phase": 1 } ], "sets": { "tally": "Every incident in the Record is in the tally quoted across the site.", "phase": "Phase 1: the 19 major attacks researched first. Phase 2: the 39 further K-12 events from the ALERRT Center 2000-2025 study. Phase 3: further events from 1999 and 2025-2026 screened against the FBI active shooter definition." } }