The Gun Violence Archive (GVA) uses a purely statistical threshold to define a mass shootings based only on the numeric value of four or more shot or killed, not including the shooter.
Soft Targets and Crowded Places (ST-CP)
Mass Shooting Prevention and Research Depository
The Gun Violence Archive (GVA) uses a purely statistical threshold to define a mass shootings based only on the numeric value of four or more shot or killed, not including the shooter.