Number of Casualties Required | None | At least three | At least three fatalities
cite page 70 Appendix I: Active Shooters vs Mass Shooting vs Mass Killing
NCIER®
Active shooter needs no minimum casualties; others require at least three
How to cite
APA
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-08, NCIER Claim Map. https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-08
HTML
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-08, NCIER Claim Map. <a href="https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-08">https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-08</a>Link to https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-08 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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