A man walks on rubble of a damaged base of the al Qaeda-linked Nusra Front, that was targeted by what activists said were U.S.-led air strikes in Reef al-Mohandeseen al-Awwal in Aleppo, November 6, 2014. Picture taken November 6, 2014. REUTERS/Abdalghne Karoof (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)