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Debates and moral panic were sparked over guns and gun control laws, high school cliques, subcultures (e. Columbine also resulted in an increased emphasis on school security with zero tolerance policies.

The incident resulted in the introduction of the Immediate Action Rapid Deployment tactic, which is used in active shooter situations. The police were slow to enter the school and were heavily criticized for not intervening during the shooting. USA Today said the attack was "planned as a grand, if badly implemented, terrorist bombing." history, which then meant exceeding the death toll of the Oklahoma City bombing. The motive remains unclear, but they had planned for around a year, hoping to massacre the most victims in U.S. Their cars in the parking lots were made into bombs which also failed to detonate, and at another location away from the school, two bombs were set up as diversions, only one of which partially detonated. Two of these were placed in the cafeteria, powerful enough to kill or seriously injure all people within the area, although they failed to detonate. In addition to the shootings, Harris and Klebold planted several homemade bombs. The crime has inspired several copycats, including many deadlier shootings across the world, and "Columbine" has become a byword for school shootings. At the time, it was the deadliest high school shooting in U.S. Another three people were injured trying to escape. Twenty-one additional people were injured by gunshots, and gunfire was also exchanged with the police. Ten students were killed in the school library, where the pair subsequently committed suicide. The perpetrators, twelfth grade ( senior) students Eric Harris and Dylan Klebold, murdered 12 students and one teacher. The Columbine High School massacre was a school shooting and failed bombing that occurred on April 20, 1999, at Columbine High School in Columbine, Colorado, United States.
