According to “United States Active Shooter Events from 2000 to 2010: Training and Equipment Implications” by J. Pete Blair and M. Hunter Martaindale from Texas State University:

  • The most commonly used weapon (60 percent) by active shooters was a pistol.
  • Attackers carried multiple weapons in 41 percent of the attacks.
  • The active-shooter attacks ended before the police arrived 49 percent of the time.
  • In 56 percent of the attacks that were still ongoing when police arrived, the police had to use force to stop the killing.
  • The median number of victims killed is two. The median number of victims shot by the suspect is four.


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