Columbine shootings: 10 year anniversary

The 13 victims from the school shooting at Columbine High school in Littleton. Top row from left are Cassie Bernall, Steven Curnow, Corey DePooter, Kelly Fleming, Matthew Kechter, and Daniel Mauser. Bottom row from left are Daniel Rohrbough, William Sanders, Rachel Scott, Isaiah Shoels, John Tomlin, Lauren Townsend, and Kyle Velasquez Photograph: AP

Columbine students run from the school Photograph: Gary Caskey/Reuters

A triage area near Columbine High School Photograph: Rodolfo Gonzalez/AP

A woman embraces her daughter after they were reunited Photograph: Ed Andrieski/AP

Students outside Columbine High School after the shooting spree Photograph: George Kochaniec/AP

Members of a police SWAT prepare to do a final search of the school Photograph: Ed Andrieski/AP

Young women head to a library near Columbine High School where students and faculty members were evacuated Photograph: Kevin Higley/AP

Students from left, Darcy Craig, Molly Byrne and Emily Dubin stop to pay their respects at a make shift memorial set up in a park near the high school Photograph: Eric Gay/AP

A couple visit 15 crosses placed on a hilltop near Columbine High School as a memorial to the vicitims Photograph: Michael S Green/AP

A boy looks through the fence at the Columbine High School tennis courts. Thirteen roses were placed on the fence in remembrance of the 13 victims Photograph: Eric Gay/AP

Students embrace each other at a makeshift memorial Photograph: Bebeto Matthews/AP

Flags at half mast at Chatfield High School as Columbine High School students arrive for classes Photograph: Michael S Green/AP

Proponents of gun control march in protest toward the National Rifle Association convention site in Denver Photograph: Michael S Green/AP

The cover of TIME magazine Photograph: Time Life Pictures/Getty

Eric Harris Photograph: Reuters

Dylan Klebold Photograph: Reuters