(New York) There have been 31 school shootings in the United States, since two students turned their weapons on classmates and a teacher in the 1999 Colorado high school massacre that forced communities across America to address youth gun violence and school security. Mary Murphy takes a look at what happened then–and since then.
Posted at 11:21 PM, Dec 14, 2012
and last updated 2012-12-15 00:39:21-05
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