Heavy clashes between Syrias army and the Islamic State group in Deir Ezzor city have killed at least 73 fighters in the last 24 hours, a monitor said Sunday.
Syria's army controls most of Deir Ezzor city, capital of Deir Ezzor province in the country's east, and made further advances after responding to an IS attack that began Saturday, the Britain-based Syrian Observatory for Human Rights monitor said.