What is a mass shooting? Definition differs among experts – By Paula Reed Ward (Trib Live) / April 24, 2022
In recent years, it seems Western Pennsylvania has seen more than its fair share of mass shootings.
• LA Fitness in 2009.
• Western Psych in 2012.
• Wilkinsburg in 2016.
• Tree of Life in 2018.
• Airbnb in 2022.
But, depending on the definition used, some of those incidents don’t qualify as a mass shooting.
Many groups — including the Associated Press/USA Today/Northeastern University Mass Killing Database — characterize a mass shooting as one in which at least four people are killed, excluding the attacker.
Others like the Washington, D.C.-based nonprofit Gun Violence Archive define a mass shooting as an incident in which at least four people are wounded — regardless of the death toll.
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