ABSTRACT
On April 20, 1999, twelve students and one teacher at Columbine High School in Littleton, Colorado, perished when Eric Harris, 18, and Dylan Klebold, 17, went on the worst mass school shooting spree in U.S. history. The teenagers injured 22 other victims before turning their weapons on themselves to claim their own lives. Police found more than 30 pipe bombs around the school, inside booby-trapped cars, and in the suspects’ two suburban homes. Some bombs were palm-sized carbon-dioxide cartridges wrapped with nails and BBs to maximize killing power. Other bombs, equipped with timers, were made from propane barbecue tanks.
