Syrian Democratic Forces (SDF) fighters Deir Al Zor province, Syria [Rodi Said/Reuters]

The US-backed Syrian Democratic Forces (SDF) have advanced into the final territorial enclave held by the Islamic State of Iraq and the Levant (ISIL or ISIS) where heavy fighting is under way.

The Kurdish-led SDF expect the battle to be over “soon”, the head of the SDF media office Mustafa Bali said on Saturday.