The army and Iranian-backed militias have in the last few months been advancing east of Aleppo city and seizing swathes of territory west of the Euphrates River that militants have pulled out of to defend their de facto capital of Raqqa, where they are now battling US-backed troops inside the city. The Syrian Observatory for Human Rights said the Syrian army, supported by Iranian-backed militias from Iraq and Lebanon, was now on the edge of the Bushra chain of mountains, a main militant hideout 55 km west of Deir Zor city. The army and Iranian-backed militias have been engaged in a campaign since May to fill the void left by the retreat of militants in areas they once controlled in the vast eastern Syrian desert that stretches all the way from central Syria to the south eastern border with Iraq and Jordan.
The Syrian army seizes oil wells in south-west Raqqa Governorate from ISIL.