Active Shooter Events: Usually One Offender
90%
Single offender
60%
Occurred inside structures
40%
Occurred outdoors
While officers must be prepared for multiple attackers, the overwhelming majority of incidents involve a lone offender. The prevalence of attacks inside buildings highlights the continued importance of room clearing, hallway movement, and interior command-and-control operations.
How Active Shooter Events End
Only about one in five active shooter incidents ends because officers shoot the suspect. The mission is not simply to engage and neutralize the threat — the larger mission is to rapidly stop the killing and immediately transition to stopping the dying.
Warning Signs Often Exist
This highlights the importance of threat assessment teams, information sharing, school and workplace reporting systems, and behavioral threat management programs.
Body Armor Is Rare
Despite public perception, only 5% of active shooters wore body armor. While officers must be prepared for armored threats, most active shooters remain vulnerable to conventional law enforcement tactics and firearms.
Key Takeaway
Modern law enforcement faces two simultaneous challenges:
- —Winning the tactical fight against threats that are often hidden behind walls, doors, and other barriers
- —Winning the rescue fight by rapidly transitioning from Stop the Killing to Stop the Dying once the threat is neutralized, contained, surrendered, or gone
Success in active shooter incidents is not measured solely by whether officers shoot the offender. More often, success is determined by how quickly responders recognize that the killing has stopped and how effectively they organize rescue, medical care, evacuation, and transport to definitive treatment.