Of the top five deadliest U.S. mass shootings, all five acts have been committed by lone gunmen. Children, women, members of the LGBT community, and, those of Mexican heritage may have been primary targets in the corresponding attacks.
In all five cases, there was a history of mental instability, to varying degrees, amongst the perpetrators.
All of the weapons utilized in the mass shootings were legally purchased, although the perpetrator in the Sandy Hook Elementary School shooting utilized his mother’s licensed weapons, which he obtained after killing her.
Note: These statistics have been updated as of June 15, 2016 to reflect revised fatalities in the Pulse nightclub mass shooting. Initial reports indicated 50 fatalities. Officials have revised that figure to 49.