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Maryland State Police patrol outside the mall.
Maryland State Police patrol outside the mall.

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    Police search for mall shooter's motive

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Police search for mall shooter's motive

Maryland police search for a 19-year-old's motive in a mall shooting. CNN's Erin McPike reports.

Police search for mall shooter's motive

Maryland police search for a 19-year-old's motive in a mall shooting. CNN's Erin McPike reports.