Columbine was a failed bombing
On April 20, 1999, Eric Harris and Dylan Klebold placed two 20-pound propane bombs in the Columbine High School cafeteria, timed for the crowded first lunch period, intending to kill hundreds. The bombs failed to detonate, and the pair improvised the shooting that killed 12 students and a teacher before they killed themselves. Cullen argues that the event remembered as the template school shooting was designed as a mass bombing, with guns meant to pick off survivors fleeing the blasts.
