Columbine High School massacre

The Columbine High School massacre, often simply referred to as Columbine, was a school shooting and a failed bombing that occurred on April 20, 1999, at Columbine High School in Columbine, Colorado, United States. west of the Littleton city limit. The United States Postal Service designates "Littleton" as the default place name for addresses in the school's ZIP code; thus, the massacre was widely reported as having happened in the adjacent city of Littleton.}} The perpetrators, twelfth-grade students Eric Harris and Dylan Klebold, murdered twelve students and one teacher. Ten of the twelve students killed were in the school library, where Harris and Klebold subsequently died by suicide. Twenty-one additional people were injured by gunshots, and gunfire was also exchanged with the police. Another three people were injured trying to escape. The Columbine massacre was the deadliest mass shooting at a K-12 school in U.S. history, until December 2012. However, the 1927 Bath School disaster (a bombing) left 44 dead. The 1966 University of Texas tower shooting was the deadliest school shooting at the time.}} Columbine is still considered one of the most infamous massacres in the U.S. for inspiring many other school shootings and bombings; the word "Columbine" has since become a byword for modern school shootings. , Columbine is still the deadliest school shooting in Colorado and one of the deadliest mass shootings in the United States.

Harris and Klebold, who planned for at least a year and hoped to have a large number of victims, intended for the attack to primarily be a bombing and only secondarily a shooting. But when several homemade bombs they planted in the school failed to detonate, the pair launched a shooting attack. Their motive remains inconclusive. The police were slow to enter the school and were heavily criticized for not intervening during the shooting. The incident resulted in the introduction of the immediate action rapid deployment (IARD) tactic, which is used in active-shooter situations, and an increased emphasis on school security with zero-tolerance policies. Debates were sparked over American gun culture and gun control laws, high school cliques, subcultures (e.g. goths), outcasts, and school bullying, as well as teenage use of pharmaceutical antidepressants, the Internet, and violence in video games and movies.

Many makeshift memorials were created after the massacre, including ones employing victims Rachel Scott's car and John Tomlin's truck. Fifteen crosses for the victims and the shooters were erected on top of a hill in Clement Park. The crosses for Harris and Klebold were later removed following controversy. Planning for a permanent memorial began in June 1999, and the resulting Columbine Memorial opened to the public in September 2007.

The shooting has inspired dozens of copycat killings, dubbed the Columbine effect, including many deadlier shootings across the world. the Sandy Hook Elementary School shooting, the Kerch Polytechnic College massacre the Stoneman Douglas High School shooting and the Erfurt school massacre}}

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