Syrian government forces clashed with Islamic State group fighters for a fourth day on Tuesday in an eastern city where a jihadist assault has left more than 100 dead, a monitor said. IS began a fierce attack Saturday on the remaining parts of Deir Ezzor under government control, and has managed to divide the city's eastern half from the west. It has also cut the supply route running from the city's key military airport, limiting the government's ability to bring in supplies and military reinforcements. The Britain-based Syrian Observatory for Human Rights monitor said on Tuesday that Syria's military and...