Mass killings

MASS KILLING INCIDENTS: Seven incidents were classified as mass killings.

See the glossary for definition of mass killing.

34 | 166 | 34 | 07 INCIDENTS | CASUALTIES | SHOOTERS | MASS KILLINGS

Mass Killing events more than doubled, rising from three to seven.

*Incidents designated as mass killings

In 2025, seven active shooter incidents met the criteria for mass killings, two occurred in Texas, while the remaining five took place in Michigan, Montana, Nevada, New York, and North Carolina.

The Owl Bar | Anaconda, MT Killed 4 | Wounded 0 | The Church of Jesus Christ Latter-day Saints | Grand Blanc, MI Killed 4 | Wounded 8

Grand Sienna Resort | Reno, NV Killed 3 | Wounded 4

345 Park Avenue | New York, NY Killed 4 | Wounded 1

Target #95 | Austin, TX Killed 3 | Wounded 3

Mission Landscape Supplies | San Antonio, TX Killed 3 | Wounded 0

Additionally, most mass killings (six) occurred in commerce locations open to the public.

The commerce location category represented the largest share of active shooter incidents in 2025, marking the highest percentage recorded since 2021, with a disproportionate number of fatalities and mass killings.

No mass killings occurred in open spaces.

Of the six incidents, none met the threshold for a mass killing.

The education category resulted in five deaths and 20 injuries, with no attacks classified as mass killings.

One of the incidents was a mass killing.

MASS KILLING INCIDENTS: Fifty incidents were classified as mass killings.

217 INCIDENTS | 1,072 CASUALTIES | 219 SHOOTERS | 50 MASS KILLINGS (including D.C.)

Met “Mass Killing” Definition | 7 | 3 | 15 | 13 | 12

This stacked bar chart displays the proportion of mass killing active shooter incidents compared to the total active shooter incidents for each year from 2021 to 2025. Each bar represents a year, divided to show the percentage of incidents classified as mass killings versus other active shooter events.

Over the past five years, 50 of the 217 incidents (23%) were classified as mass killings, averaging 10 per year.

Definition | One or more individuals actively engaged in killing or attempting to kill people in a populated area | Three or more individuals injured and/or killed in a single incident | Three or more individuals killed in a single incident excluding the shooter

Number of Casualties Required | None | At least three | At least three fatalities

MASS KILLING: three or more individuals killed in a single incident not including the shooter MASS SHOOTING: three or more individuals injured and/or killed in a single incident not including the shooter MULTIPLE LOCATIONS: incidents where an active shooting attack occurred at more than one location PREDATORY BEHAVIOR: incidents when a perpetrator considers, plans, and prepares for the act of violence; they are preceded by observable warning sign behaviors that, if recognized and reported, can provide opportunities for disruption SECURITY INTERVENTION: instances where security personnel intervened or attempted to intervene to end an active shooter incident