Columbine

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http://www.usatoday.com/news/nation/2009-04-13-columbine-myths_N.htm?

"The pair planned the attacks for more than a year, building 100 bombs and persuading friends to buy them guns. Just after 11 a.m. on April 20, they lugged a pair of duffel bags containing propane-tank bombs into Columbine's crowded cafeteria and another into the kitchen, then stepped outside and waited.

"Had the bombs exploded, they'd have killed virtually everyone eating lunch and brought the school's second-story library down atop the cafeteria, police say. Armed with a pistol, a rifle and two sawed-off shotguns, the pair planned to pick off survivors fleeing the carnage.

"As a last terrorist act, a pair of gasoline bombs planted in Harris' Honda and Klebold's BMW had been rigged apparently to kill police, rescue teams, journalists and parents who rushed to the school . long after the pair expected they would be dead.

"The pair had parked the cars about 100 yards apart in the student lot. The bombs didn't go off."