DAVID GREENE: 50" FirstFeed="N">Study: Mass Shootings Are On The Rise Across U.S.It is among the most troubling calls a police department can receive - the report of an active shooter. It could mean a domestic dispute, or a gunman on the loose. We all remember Newtown, Conn.; and Aurora, Colo. Those events, mass shootings, have spiked in the United States, in recent years. ]]>

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