BBC News reports Palestinian factions in Syria's Yarmouk refugee camp have agreed to government action to combat Islamic State (IS) militants, Palestinian officials say. The situation has deteriorated since April 1st, when IS fighters launched an offensive. Before that the camp had been under siege by government forces for months, creating a grave humanitarian crisis. It is unclear whether all Palestinian factions in the camp have agreed to Syrian government intervention. Anti-government Palestinian militiamen and some Free Syrian Army fighters have been leading the fight against IS. "The operation will be conducted in cooperation between the Palestinian groups in Syria and the Syrian government through a joint operation center," Palestine Liberation Organization (PLO) official Ahmed Majdalani - who is heading a Palestinian delegation in Damascus - told the BBC.