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FILE - I this file photo taken Friday, Jan. 24, 2014, an Egyptian man stands in the rubble after an explosion at the Egyptian police headquarters in downtown Cairo. 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/Khalil Hamra, File)

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