Pakistan paramilitary troops patrol in Karachi, Pakistan, Monday, Dec. 10, 2012. Gunmen attacked a checkpoint manned by paramilitary forces on the outskirts of the southern city of Karachi, killing soldiers, police said. (AP Photo/Shakil Adil)

Associated Press
Pakistan paramilitary troops patrol in Karachi, Pakistan, Monday, Dec. 10, 2012. Gunmen attacked a checkpoint manned by paramilitary forces on the outskirts of the southern city of Karachi, killing soldiers, police said. (AP Photo/Shakil Adil)
Pakistan paramilitary troops patrol in Karachi, Pakistan, Monday, Dec. 10, 2012. Gunmen attacked a checkpoint manned by paramilitary forces on the outskirts of the southern city of Karachi, killing soldiers, police said. (AP Photo/Shakil Adil)
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