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This image from amateur video that AP obtained from Ugarit News has been authenticated based on its contents and other AP reporting and shows a rebel firing a weapon around a corner at Syrian government forces in Damascus, Syria, on Dec. 7, 2012. Fighting around the Syrian capital intensified as rebels press a battle they hope will lead to the collapse of President Bashar Assad's regime after 20 months of conflict. (Associated Press/Ugarit News via AP Video)

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