Shootings are incidents involving multiple victims of firearm-related violence.
The precise inclusion criteria are disputed, and there is no broadly accepted definition.
[2][3] Gun Violence Archive, a nonprofit research group that tracks shootings and their characteristics in the United States, defines a mass shooting as an incident in which four or more people, excluding the perpetrator(s), are shot in one location at roughly the same time.
[5][6] The crowdsourced Mass Shooting Tracker project has the most expansive definition of four or more shot in any incident, including the perpetrator in the victim inclusion criteria.
[7] There were 614 mass shootings in 2020 that fit the inclusion criteria of this article, resulting in 446 deaths and 2,515 injuries, for a total of 2,961 victims.