The Columbine High School massacre was a school shooting that occurred on April 20, 1999, at Columbine High School in Columbine, Colorado, an unincorporated area of Jefferson County in the state of Colorado. In addition to the shootings, the complex and highly planned attack involved a fire bomb to divert fire-fighters, propane tanks converted to bombs placed in the cafeteria, 99 explosive devices, and bombs rigged in cars.

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