The Associated Press (AP)/USA Today/Northeastern University defines a mass shooting as when four or more people, excluding the killer, are killed within a span of 24 hours.
Soft Targets and Crowded Places (ST-CP)
Mass Shooting Prevention and Research Depository
The Associated Press (AP)/USA Today/Northeastern University defines a mass shooting as when four or more people, excluding the killer, are killed within a span of 24 hours.