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    Police probe shooter's past after Orlando massacre

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Police probe shooter's past after Orlando massacre

One day after the deadliest terrorist attack since 9/11 in the U.S., police and investigators work to learn more about American-born shooter Omar Mateen. CNN's Delia Gallagher reports.

Police probe shooter's past after Orlando massacre

One day after the deadliest terrorist attack since 9/11 in the U.S., police and investigators work to learn more about American-born shooter Omar Mateen. CNN's Delia Gallagher reports.