Pictures from World History: April 20, 1999: The Columbine High School shooting shook the world

23 years ago today, students Eric Harris and Dylan Klebold opened fire on classmates at Columbine High School in Colorado. 15 people die, including the two gunmen.

23 years ago today, students Eric Harris and Dylan Klebold opened fire on classmates at Columbine High School in Colorado. 15 people die, including the two gunmen.