Colorado observes 20th anniversary of Columbine school massacre
Several mass school shootings since have led to calls to change gun laws in the US.
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Saturday marks the 20th anniversary of the Columbine High School shooting in the United States.
Twelve students and a teacher were killed when two teenagers carried out a planned attack at the school in Colorado.
Several mass school shootings since have led to calls to change gun laws in the US.
Al Jazeera’s Alan Fisher reports.
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Published On 20 Apr 2019