This image taken from video obtained from Ugarit News, which has been authenticated based on its contents and other AP reporting, shows smoke and fire billowing from an explosion in Damascus, Syria, Wednesday, Feb. 6, 2013. Heavy fighting erupted in Damascus Wednesday as government forces tried to hold back a new rebel effort to push the civil war into the heart of the Syrian capital, activists said.(AP Photo/Ugarit News via AP video)
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