The Columbine High School massacre occurred on April 20, 1999, at Columbine High School in Columbine, an unincorporated area of Jefferson County in the U.S. state of Colorado. In addition to the shootings, the complex and highly planned attack involved a fire bomb to divert firefighters, propane tanks converted to bombs placed in the school cafeteria, 99 explosive devices, and several car bombs. The perpetrators, senior students Eric Harris and Dylan Klebold, murdered 12 students and one teacher. They injured 21 additional people, and three more were injured while attempting to escape the school. The pair committed suicide in the school library.
Although their motives remain unclear, the personal journals of the perpetrators document that they wished their actions to rival the Oklahoma City bombing and other deadly incidents in the United States in the 1990s. The attack has been referred to by USA Today as a “suicidal attack [that was] planned as a grand – if badly implemented – terrorist bombing.” The massacre is reported as “the deadliest high school shooting in US history.”
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