Students and staff mark the anniversary of the Columbine massacre
Events have been held to mark 10 years since the massacre at Columbine High School, where two former pupils killed 12 students and a teacher.
Flags flew at half-mast in Littleton, Colorado, and across the state.
Some 1,000 survivors of the massacre, relatives of victims and current students attended a sunset service next to the school at Clement Park.
On 20 April 1999, teenagers Eric Harris and Dylan Klebold rampaged through the school before shooting themselves dead.
More than 20 other people were injured during the incident, the worst high school massacre in US history.
Columbine High School was closed on Monday, as it has been on every 20 April since the massacre out of respect for the victims.
With many in attendance at Monday's evening service wearing the school's blue and white colours, a dove was released as the name of each victim was read out by the school's long-serving head teacher, Frank DeAngelis.
From here on out we're really going to try to celebrate his life
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