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)
The Most Comprehensive and Up-To-Date Online Data Depositary for Helping Society, the Systems, and the Venues to Learn How to Prevent Mass Shootings
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.