Note: These statistics don’t include the shooter or shooters if they were killed or committed suicide in the course of the incident (Not my choice: that’s just the way the statistics are presented in this source). They also don’t include one shooting from 1949, as the stats don’t cover the rest of that decade, or any previous period.
1960s: 1 (University of Texas tower shooting)
2010s: 12 and counting
Eighteen of these 32 shootings took place since 2007.
Four of the five deadliest shootings have occurred in the last five years. Three of the five deadliest have occurred in the last 17 months. Two of the five deadliest have occurred in the last 32 days.