An opposition fighter walks near a vehicle flying a black Jihadist flag with Islamic writing on it proclaiming in Arabic that "There is no God but God and Mohammed is the prophet of God" in the northern rebel-held Syrian city of Raqqa on October 6, 2013. UN-Arab League peace envoy Lakhdar Brahimi urged Syria's warring parties to hold talks "without preconditions" and said he hoped negotiations could take place in Geneva in late November. AFP PHOTO/MOHAMMED ABDEL AZIZ        (Photo credit should read MOHAMMED ABDUL AZIZ/AFP/Getty Images)