Definition | One or more individuals actively engaged in killing or attempting to kill people in a populated area | Three or more individuals injured and/or killed in a single incident | Three or more individuals killed in a single incident excluding the shooter
cite page 70 Appendix I: Active Shooters vs Mass Shooting vs Mass Killing
APA
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-06, NCIER Claim Map. https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-06
HTML
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-06, NCIER Claim Map. <a href="https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-06">https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-06</a>Link to https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-06 from your own pages; it resolves to this claim and its highlighted source passage.
License: CC BY 4.0. Free to reuse with attribution: credit NCIER Claim Map and link to the claim.
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