Syria’s interim president, Ahmed al-Shara, appealed on Sunday for calm and for unity as he moved to reassure the nation after days of clashes that a monitoring group said had killed hundreds of people. “We must preserve national unity and…

Syria’s interim president, Ahmed al-Shara, appealed on Sunday for calm and for unity as he moved to reassure the nation after days of clashes that a monitoring group said had killed hundreds of people. “We must preserve national unity and…