The Syrian government has said a call by U.N.-Arab League envoy Lakhdar Brahimi for a ceasefire during the Muslim holiday of Eid al-Adha this month would likely fail because there is no unified rebel leadership to sign such an agreement. Rebel groups, meanwhile, say they have agreed to unify and establish joint leadership in their struggle to oust Syrian President Bashar al-Assad. A unity conference has reportedly been set for early November. On Tuesday, the Syrian military bombarded rebel areas in the north of the country with air strikes and artillery, killing at least 90 people, according to activists. Meanwhile, officials from the World Food Program said some 1.4 million people in Syria required assistance last month, but the violence prevented workers from reaching some of those in need.