Mass killings fall to lowest level in nearly two decades, national database shows

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The U.S. has recorded 17 mass killings so far in 2025, the lowest number since 2006, according to a long-running national database tracking such incidents.

The database, which is maintained by The Associated Press, USA Today and Northeastern University, defines a mass killing as an incident in which four or more people are intentionally killed within a 24-hour period, excluding the perpetrator.

Not all of this year’s mass killings involved firearms, but most did.

Fourteen of the 17 mass killings in 2025 were carried out with guns. The data did not detail the three non-firearm incidents in its summary, but based on the database’s methodology and past reporting, non-gun mass killings typically involve stabbings, intentional arson, blunt-force a