Chart showing how active shooter events ended. Of the cases that ended before the police arrived, 67 percent (34) ended with attackers stopping themselves via suicide (29 cases) or by leaving the scene (5 cases). In the other 33 percent (17) of the cases that ended before the police arrived, the potential victims at the scene stopped the shooter themselves. Most commonly they physically subdued the attacker (14 cases), but 3 cases involved people at the scene shooting the perpetrator to end the attack.