Jan 11, 2026
Most ViewedMass murders in 2025
2025 saw a surprising decline in the number of U.S. mass killings compared with recent years: databases tracking incidents that meet the FBI/AP definition (four or more deaths in a 24‑hour period, exc...
Mass Shooting Definitions
The impact of varying definitions of mass shootings on data and policy discussions
Fact-Checks
6 resultsFeb 6, 2026
How often are mass shooters’ political affiliations verifiable in public records and reporting?
Public reporting and open-source databases routinely document many traits of — mental health history, prior trauma, mode of attack — but they rarely produce reliable, verifiable records of a shooter’s...
Jan 30, 2026
How do researchers define 'mass shooting' and does definition affect counts by political affiliation?
Researchers do not agree on a single definition of "," and the way scholars and databases set victim thresholds, include or exclude domestic or gang-related incidents, or focus on "public" attacks mat...
Jan 13, 2026
what kind of gun policies could prevent mass shootings?
A combination of targeted interventions—extreme risk protection orders, comprehensive background checks and licensing, limits on high-capacity magazines and certain semi-automatic rifles, safe-storage...
Jan 9, 2026
How do Everytown and Mother Jones define mass shootings and how do their counts differ from GVA and the FBI?
Everytown defines mass shootings by a high fatality threshold—four or more people killed in a single incident—and counts only events that meet that fatality bar, while Mother Jones focuses on indiscri...
Jan 5, 2026
Which demographic groups are most frequently identified as perpetrators in US mass shootings since 2000?
Since 2000 the clearest, unambiguous demographic pattern in U.S. mass shootings is sex: perpetrators are overwhelmingly male, while other characteristics — race, age, socioeconomic status, and mental-...