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A mass shooting is an incident involving multiple victims of firearm-related violence. There is no widely accepted definition of the term “mass shooting”, although it is normally understood to exclude mass killings as a result of terrorist, authorised law enforcement or authorised military actions
The Investigative Assistance for Violent Crimes Act of 2012, signed into law in January 2013, defines a “mass killing” as one resulting in at least 3 victims, excluding the perpetrator. In 2015, the Congressional Research Service defined a mass shooting — for the purposes of its report entitled “Mass Murder with Firearms” — as “a multiple homicide incident in which four or more victims are murdered with firearms, within one event, and in one or more locations in close proximity”. A broader definition, as used by the Gun Violence Archive, is that of “4 or more shot or killed, not including the shooter”.
Trauma in the Context of Mass Shootings
Journal of Traumatic Stress published on behalf of International Society for Traumatic Stress Studies (ISSTS)
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