[Props to the Agents who did the statistical collations]

In 64 incidents (40.0%), the shooters committed suicide; 54 shooters did so at the scene of the crime.

"Of the 160 incidents, at least 107 (66.9%) ended before police arrived and could engage the shooter, either because a citizen intervened, the shooter fled, or the shooter committed suicide or was killed by someone at the scene."

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 were students). ■ 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 ■ In 2 incidents (1.3%), 2 armed, off-duty police officers engaged the shooters, resulting in the death of the shooters. In 1 of those incidents, the off-duty officer assisted a responding officer to end the threat.26

https://www.fbi.gov/file-repository/...000-2013-1.pdf

40 incidents in 26 states:20 incidents in 2014; 20 incidents in 2015.
231 casualties: 92 killed and 139 wounded (excluding the shooters).
4 law enforcement officers killed and 10 wounded in 6 incidents.
3 unarmed security guards wounded.

6 incidents ended when citizens acted to end the threat.
26 incidents ended with law enforcement at the scene.
14 incidents ended with an exchange of gunfire between the 16 shooters and law enforcement.
12 killed by police, one off-duty.
3 committed suicide. 1 surrendered to law enforcement.
42 shooters; 39 male 3 female.
2 husband-and-wife teams.

16 shooters committed suicide.
14 shooters were killed by law enforcement.
12 shooters were apprehended.

https://www.fbi.gov/file-repository/..._2014-2015.pdf