Columbine High School massacre

A school shooting and attempted bombing carried out by two students at Columbine High School in Littleton, Colorado, on April 20, 1999. The attack killed 13 people and wounded more than 20 before the perpetrators died by suicide.

Eric Harris and Dylan Klebold: The two Columbine High School students who carried out the attack and died by suicide. Their planning and actions define the perpetrators’ role in the massacre.
Columbine High School massacre planning: The preparations made by Harris and Klebold before the attack. Advance planning shaped the attack’s timing, weapons, and intended bombing.
Eric Harris: One of the two students who carried out the Columbine High School attack. His journals and online writings formed part of the evidence about preparation and motive.
Columbine effect: The influence of the Columbine attack on later mass shootings, media coverage, and public fears. The term captures the attack’s perceived influence beyond the school and its victims.
Virginia Tech shooting: A mass shooting at Virginia Tech on April 16, 2007, carried out by student Seung-Hui Cho. Its much larger death toll and single perpetrator distinguish it from Columbine.
Columbine High School library: The school library where most of the attack’s fatalities occurred. The library became the site of the deadliest part of the attack.
Propane bomb: An explosive device that uses propane fuel to create a blast and fire. The perpetrators planted propane bombs that failed to detonate as intended.
Dylan Klebold: One of the two students who carried out the Columbine High School attack. His writings and personal history were examined alongside Harris’s in the investigation.
Active shooter training: Instruction that prepares people to respond during an ongoing armed attack. Post-Columbine policies increasingly emphasized rapid intervention and civilian preparedness.
Sandy Hook Elementary School shooting: A mass shooting at Sandy Hook Elementary School in Newtown, Connecticut, on December 14, 2012. The attack involved an elementary school and a perpetrator with no school affiliation.

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School violenceBroader topic: Its extensive coverage reshaped public debate about school attacks and security.