Columbine High School shooting 13 dead, dozens hurt in 1999 massacre(01)

Columbine High School shooting 13 dead, dozens hurt in 1999 massacre(01)


Image gallery: Breaking News: Columbine Murder Photos That Could Change Everything

Columbine 25 Years Later Impact Rachel's Challenge Columbine High School shooting 13 dead, dozens hurt in 1999 massacre Death Toll in 1999 Columbine School Shooting Climbs to 14 With Homicide Columbine school shooting Author Dave Cullen says Columbine "changed What Does ‘Active Shooter’ Really Mean? The New York Times