FILE - In this file photo taken early on Tuesday, Dec. 24. 2013, Egyptians gather after an explosion believed to be caused by a car bomb rocked a police headquarters 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, File)
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