The violent massacres that occurred in Newtown, Aurora, Blacksburg, and Columbine were borne of very different circumstances — but there were some similarities. In each case, the shooter used a semiautomatic assault weapon or large-capacity ammunition magazine. Mass shooting location, date Weapon(s) used Columbine, Colorado, 1999 Hi-Point Model 995 carbine rifle, Savage Springfield 67H shotgun, [...]
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