Islamic State says it has full control of Syria's Palmyra

By Sylvia Westall BEIRUT (Reuters) - Islamic State fighters tightened their grip on the historic Syrian city of Palmyra on Thursday and overran Iraqi government defenses east of Ramadi, the provincial capital that they had seized five days earlier. The twin successes not only pile pressure on Damascus and Baghdad but also throw doubt on a U.S. strategy of relying almost exclusively on air strikes to support the fight against Islamic State. The British-based Syrian Observatory for Human Rights sa