The Worst Daily.

Dark list, but deal with it. You won’t see the names of any of the perps, they don’t need to be remembered.

Ranked by notoriety.

5. Amish school shootings - October 2 2006
4. University of Texas Clock Tower - August 1, 1966
3. Beslan hostage crisis - September 1, 2004
2. Columbine - April 20, 1999
1. Virgin Tech - April 16, 2007