Mass shootings in the United States
Mass shootings are events where there are many victims of firearm-related violence. There is no exact definition for a "mass shooting". One definition is that a mass shooting is an act of public firearm violence in which a shooter kills at least four victims. Gang killings, domestic violence, or terrorist acts by an organization are not included. With this definition, one study found that about one-third of the world's public mass shootings between 1966 and 2012 (90 of 292 events) happened in the United States. The Washington Post recorded 163 mass shootings in the United States between 1967 and June 2019.