ABC News Classics The Columbine Shootings

It started with gunshots in the schoolyard just before lunchtime, and then the carnage moved inside. For more than four hours on that fateful day, Columbine High School near Littleton, Colorado was a killing ground. Two students murdered 13 people and wounded another 33 with gunfire and pipebombs before taking their own lives. The motives of Eric Harris and Dylan Klebold remain a mystery, although investigators have formed theories based on what was found in the killers' homes and on their personal computers. The words "psychopath" and "depression" figure prominently in the experts' findings. ABC News takes you back to April 20, 1999. Interviews with several of the students in the school at the time of the shooting bring to life the horror of that day.

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