A mass shooting is a violent crime in which one or more attackers kill or injure multiple individuals simultaneously using a firearm. There is no widely accepted definition of "mass shooting" and different organizations tracking such incidents use different definitions. Definitions of mass shootings exclude warfare and sometimes exclude instances of gang violence, armed robberies, familicides and terrorism. The perpetrator of an ongoing mass shooting may be referred to as an active shooter.
In the United States, the country with the most mass shootings, the Investigative Assistance for Violent Crimes Act of 2012 defines mass killings as three or more killings in a single incident.[1] A Congressional Research Service report from 2013 specifies four or more killings on indiscriminate victims while excluding violence committed as a means to an end, such as robbery or terrorism.[2] Media outlets such as CNN and some crime violence research groups such as the Gun Violence Archive define mass shootings as involving "four or more shot (injured or killed) in a single incident, at the same general time and location, not including the shooter".[3] Mother Jones magazine defines mass shootings as indiscriminate rampages killing three or more individuals excluding the perpetrator, gang violence, and armed robbery.[4][5] An Australian study from 2006 specifies five individuals killed.[6]
Mass shootings in the US, defined as 4 or more gunfire victims in a single incident, were running in 2024 at one every 16 hours; in the second half of May 2024 they have occurred on average every 12 hours.[7]
The motive for mass shootings (that occur in public locations) is usually that they are committed by deeply disgruntled individuals who are seeking revenge for failures in school, career, romance, or life in general[8] or who are seeking fame or attention[9] with at least 16 mass shooters since the Columbine massacre citing fame or notoriety as a motive.[10] Fame seekers average more than double the body counts, and many articulated a desire to surpass "past records".[10]
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