On April 20, 1999, two seniors at Columbine High School in Littleton High School shot and killed twelve students and one teacher before killing themselves after exchanging gunfire with police. 25 years after the Columbine shooting, school security is a rapidly evolving field in Colorado and elsewhere in the U.S. The Columbine school shooting was the deadliest mass shooting at a U.S. K-12 school in history until it was passed by Sandy Hook in 2012 and Uvalde in 2022. 

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