FILE - In this file photo taken Tuesday, Dec. 24, 2013, Egyptian policemen stand guard at the scene of a powerful explosion believed to be a car bomb at a police headquarters building that killed at least a dozen people, wounded more than 100, and left scores buried under the rubble, in the Nile Delta city of Mansoura, 110 kilometers (70 miles) north of Cairo, Egypt. The militant group Ansar Beit al-Maqdis, which has waged a campaign of bombings and assassinations for months in Egypt, has quickly advanced in weaponry and sophistication of attacks, drawing on the experience of Egyptians who fought in Syria. (AP Photo/Ahmed Ashraf, File)
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