A vehicle burns following a car bomb blast outside a church in the northern Egyptian city of Alexandria in this January 1, 2011 picture. Egypt tightened security around churches on January 6, 2011, the eve of Coptic Christmas, after a New Year's Day bombing killed up to 23 and sparked angry protests by Christians demanding more protection from Muslim militants. Picture taken January 1, 2011. REUTERS/Stringer (EGYPT - Tags: CIVIL UNREST POLITICS RELIGION)

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