FBI report on active shooters during 2016-2017

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3. Civilians, some armed and some unarmed, successfully stopped 8 of 50 ...

active shooter incidents.

From the report:

Citizen Engagement and Casualties

In 10 incidents, citizens confronted the shooter. In eight of those incidents, one or more citizens safely and successfully acted to end the shooting.
■ In four incidents, unarmed citizens confronted or persuaded the shooter to end the shooting.
In two incidents. school staff confronted and restrained the shooter. In one incident the citizen used his car to thwart the shooter. In one incident the citizen persuaded the shooter to surrender via telephone during a police chase; she ran up to the shooter’s car as he came to a stop and pulled him out of his seat, bringing the chase to an end.
■ In four incidents, citizens possessing valid firearms permits successfully stopped the shooter. In two incidents,20 citizens exchanged gunfire with the shooter. In two incidents, the citizens held the shooter at gunpoint until law enforcement arrived.
■ In one incident, a citizen possessing a valid firearms permit exchanged gunfire with the shooter, causing the shooter to flee to another scene and continue shooting.
■ In one incident, a citizen possessing a valid firearms permit was wounded before he could fire at the shooter.

***snip***

Armed and unarmed citizens engaged the shooter in 10 incidents. They safely and successfully ended the shootings in eight of those incidents. Their selfless actions likely saved many lives.
https://www.fbi.gov/file-repository/active-shooter-incidents-us-2016-2017.pdf/view