U.S.-backed Syrian fighters on Monday cut the main road between the northern Syrian city of Raqqa, which is controlled by the Islamic State group, and the eastern city of Deir el-Zour, which is partially held by IS, as they press into the extremists’ territory in Syria. But despite the fresh blockade on the Raqqa-Deir el-Zour road, IS still controls large swaths of ground south of Raqqa. SDF spokesman Talal Sillo told The Associated Press that “our forces have cut the main supply line between Raqqa and Deir el-Zour.” He added that it is still too early to impose a siege on Raqqa because the extremists still control areas west and south of the city.