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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. ]]>In a nutshell, what we're looking at is instances of attempted mass murder. Somebody goes to a location with the intent to kill a lot of people. From about 2000 to 2008, you see roughly five attacks per year going on. And then in 2009, there's a spike - where it goes up - and since 2009, we've been averaging about 15 attacks per year. ]]>

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