The terms “mass shooting” and “mass killing” are sometimes used interchangeably, and they can overlap with what are called active shooter incidents.
cite page 70 Appendix I: Active Shooters vs Mass Shooting vs Mass Killing
NCIER®
Mass shooting and mass killing terms are sometimes used interchangeably and can overlap
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APA
Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-02, NCIER Claim Map. https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-02
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Federal Bureau of Investigation. (2026). Active Shooter Incidents in the United States in 2025 (p. 70). Claim p070-02, NCIER Claim Map. <a href="https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-02">https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-02</a>Link to https://ncier.org/research/claim-maps/fbi-active-shooter-2025/claims/p070-02 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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