Pittsburgh Police Chief Nate Harper, center, briefs media outside the 3 Gateway Center building, rear center, in downtown Pittsburgh, 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 3 Gateway Center building. (AP Photo/Gene J. Puskar)

Associated Press
Pittsburgh Police Chief Nate Harper, center, briefs media outside the 3 Gateway Center building, rear center, in downtown Pittsburgh, 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 3 Gateway Center building. (AP Photo/Gene J. Puskar)
Pittsburgh Police Chief Nate Harper, center, briefs media outside the 3 Gateway Center building, rear center, in downtown Pittsburgh, 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 3 Gateway Center building. (AP Photo/Gene J. Puskar)
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