In 21 incidents (13.1%), the situation ended after unarmed citizens safely and successfully
restrained the shooter. In 2 of those incidents,24 3 off-duty law enforcement
officers were present and assisted.
? Of note, 11 of the incidents involved unarmed principals, teachers, other school
staff and students who confronted shooters to end the threat (9 of those shooters
? In 5 incidents (3.1%), the shooting ended after armed individuals who were not law
enforcement personnel exchanged gunfire with the shooters. In these incidents, 3 shooters
were killed, 1 was wounded, and 1 committed suicide.
? The individuals involved in these shootings included a citizen with a valid firearms
permit and armed security guards at a church, an airline counter, a federally
managed museum, and a school board meeting.25
And that's from "A Study of Active Shooter
Incidents in the United States
Between 2000 and 2013", which came out in 2014.