The shooters in all of these tragic situations were either currently enrolled at the school or were former students. With each incident, there were warning signs before any bullets were fired.
| Year | Location | Deaths |
|---|---|---|
| 2018 | Marjory Stoneman Douglas High School (Florida) | 17 |
| 2012 | Sandy Hook Elementary School (Connecticut) | 26 |
| 2007 | Virginia Tech University | 32 |
| 1999 | Columbine High School (Colorado) | 13 |
| 1966 | University of Texas Austin | 14 |
