The Columbine High School massacre occurred on Tuesday, April 20, 1999, at Columbine High School in unincorporated Jefferson County, Colorado (the CDP of Columbine) near Denver and Littleton. Two students, Eric Harris and Dylan Klebold, carried out a shooting rampage, killing 12 students and a teacher, as well as wounding 24 others, before committing suicide. It was the third-deadliest school shooting in United States history, after the 1966 University of Texas massacre and the 2007 Virginia Tech massacre.
The massacre provoked debate regarding gun control laws, the availability of firearms in the United States, and gun violence involving youths. Much discussion also centered on the nature of high school cliques, subcultures and bullying, as well as the role of violent movies and video games in American society. The shooting also resulted in an increased emphasis on school security, and a moral panic aimed at goth culture, social pariahs, the gun culture, the use of pharmaceutical anti-depressants by teenagers, violent films and music, teenage internet use, and violent video games.