The Saudi and Syrian leaders met in Riyadh on Sunday to discuss the tensions in Lebanon over the fate of the UN probe into the 2005 assassination of ex-premier Rafiq Hariri. The meeting between King Abdullah and President Bashar al-Assad was held at Riyadh air base, the official SPA news agency reported. The talksfocused on "the latest developments in Islamic and Arab plans and the positions of the two countries, primarily on the Palestinian question." The news agency added the Syrian president left after the talks. Lebanon's PM Saad Hariri was in Saudi Arabia on a family visit on Sunday, but Lebanese officials told AFP he did nor join Abdullah and Assad in their discussions. In Beirut, meanwhile, senior US envoy Jeffrey Feltman on Sunday underlined Washington's firm support for the international tribunal in Hariri's case. "We believe that the tribunal should be allowed to complete its work on its own timeline and without outside interference until those responsible ... are brought to justice," Feltman told reporters at Beirut airport.