Columbine High School massacre Columbine High School massacre The Columbine High School massacre was a school shooting that occurred on April 20, 1999, at Columbine High School in Columbine, an unincorporated area of Jefferson County (Jeffco), Colorado, United States, near Littleton in the Denver metropolitan area. The perpetrators, twelfth grade (senior) students Eric Harris and Dylan Klebold, murdered 12 students and one teacher. Ten students were murdered in the library, where the pair subsequently committed suicide. At the time, it was the deadliest school shooting ever. The crime has inspired several copycats, and "Columbine" has become a euphemism for a school shooting. They injured
Columbine High School massacre progress of the SWAT teams during the shooting. Sheriff Stone did not seek reelection. Police followed the traditional tactic at Columbine: surround the building, set up a perimeter, and contain the damage. That approach has been replaced by a tactic that takes into account the presence of an active shooter whose interest is to kill, not to take hostages, known as the Immediate Action Rapid Deployment tactic. This tactic calls for a four-person team to advance into the site of any ongoing shooting, optimally a diamond-shaped wedge, but even with just a single officer if more are not available. Police