Syrian rebels run during heavy clashes with soldiers loyal to Syrian President Bashar Assad in the Salah al-Din neighborhood of Aleppo, Syria, on Tuesday, July 9, 2013, in this citizen journalism image authenticated by its contents and other AP reporting. Syria is entering its third year of a war that began as an uprising against Mr. Assad's rule. (AP Photo/Aleppo Media Center)

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Syrian rebels run during heavy clashes with soldiers loyal to Syrian President Bashar Assad in the Salah al-Din neighborhood of Aleppo, Syria, on Tuesday, July 9, 2013, in this citizen journalism image authenticated by its contents and other AP reporting. Syria is entering its third year of a war that began as an uprising against Mr. Assad's rule. (AP Photo/Aleppo Media Center)