To identify incidents that fit the active shooter definition, the FBI relies on multiple sources to include internal FBI records, official reports from investigating agencies when available, and information gathered from open-source outlets.
NCIER®
FBI identifies incidents using internal records, agency reports and open sources
How to cite
APA
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 9). Claim p009-01, NCIER Claim Map. https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p009-01
HTML
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 9). Claim p009-01, NCIER Claim Map. <a href="https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p009-01">https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p009-01</a>Link to https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p009-01 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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