Palestinian Hamas leader Khaled Mashaal was a close ally of Syria and lived in the capital Damascus for years. But relations soured over the uprising in Syria, and Syria's state television denounced him in withering terms. Mashaal is shown speaking at a conference in Turkey on Sunday. Kayhan Ozer/AP hide caption

toggle caption Kayhan Ozer/AP

Palestinian Authority head Mahmoud Abbas delivers a speech in Cairo on May 4, 2011 during a Palestinian unity ceremony. THAER GHANEM/AFP/Getty Images hide caption

toggle caption THAER GHANEM/AFP/Getty Images

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