There have been a number of academic studies done on active shooting incidents. Here are some statistics from two of those studies.
John Nicolette, PhD, conducted a study of 35 active shooter incidents during 2012 and discussed the results of his study during a lecture entitled “Detection and Disruption of Insider/Outsider Perpetrated Violence.”
The average active shooter incident lasts 12 minutes, while 37 percent last less than five minutes.
49 percent of attackers committed suicide, 34 percent were arrested, and 17 percent were killed.
51 percent of the attacks studied occurred in the workplace, while 17 percent occurred in a school, 17 percent occurred in a public place, and six percent occurred in a religious establishment.