Bill Clinton: 'Columbine has a special place in my heart'

A remembrance ceremony has been held in Denver, Colorado to mark the 20th anniversary of the Columbine High School massacre.

Twelve students and a teacher were murdered by two teenagers.

Bill Clinton, who was US president at the time of the shootings, addressed the crowd by video link.

Read more: Columbine survivors mark 20th anniversary of massacre

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