Images: Pittsburgh standoff

Posted: 11:51 AM EDT Sep 21, 2012   Updated: 1:37 PM EDT Sep 21, 2012

Police work to resolve an armed hostage situation on the 16th floor of a building in downtown Pittsburgh.

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Gene J. Puskar, AP

Pittsburgh police Chief Nate Harper, center, briefs media outside the Three Gateway Center building, rear center, in downtown Pittsburgh on Friday, Sept. 21, 2012. Police are trying to negotiate with a man claiming to have a bomb and a gun on the 16th floor of the Three Gateway Center building.

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