The 20 April 1999 Eric Harris e Dylan Klebold were introduced in the Columbine High School armed with pistols and shotguns, shot at killing classmates and teachers 13 people, wounding 24 killing and then in turn.
Studio Universal (Mediaset Premium DTT roll) recalls the 15 years since the Columbine massacre with Bowling a Columbine Michael Moore (2002) Academy Award winner for Best Documentary.
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