Columbine High School massacre

The Columbine High School Massacre occurred on April 20, 1999 at Columbine High School in Jefferson County near Littleton, Colorado, United States. Two teenage students, Eric Harris and Dylan Klebold, executed a planned shooting rampage killing 12 other students and a teacher before committing suicide. It is considered to be the worst school shooting in U.S. history.

Part of a rash of similar shootings, the events triggered a wide-ranging debate about the effect of violent entertainment, particularly the videogames Doom and Quake.