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The source said combat operations would accelerate towards the town of al-Sukhna, some 50 km (30 miles) from the administrative frontier of Deir al-Zor province, where IS has redeployed many fighters after losing ground in Syria and Iraq.
Islamic State chief Baghdadi killed: Syrian Observatory
"Capturing al-Sukhna means opening the door and path for forces to move to Deir al-Zor directly," the source told Reuters, adding that the military had captured positions 8 km (5 miles) southwest of the town on Wednesday evening. Islamic State is losing ground fast in Syria to separate campaigns waged by the Russian-backed Syrian government on the one hand, and to US-backed Kurdish forces and their allies on the other.
Government forces, backed by the Russian air force and Iran-backed militias, have also been advancing against IS in Hama province and in southern areas of Raqqa province. US-led operations against IS are currently focused ontaking Raqqa city. Government forces have been approaching al-Sukhna gradually since capturing the ancient city of Palmyra, some 50 km away, in March.
In Syria's Raqa, anti-Islamic State fighters advance at night
"It is natural that combat operations escalate in this direction and take on a stronger and faster nature," the source said, adding that Islamic State had concentrated forces in al-Sukhna. The Syrian Observatory for Human Rights said the government forces were being supported in the attack by Russian air strikes and allied militias, and had moved to within 5 km of al-Sukhna.
Deir al-Zor province, which borders Iraq to the east, is almost entirely under Islamic State control. The Syrian government has held on to a pocket of territory in the provincial capital of Deir al-Zor city, and at nearby air base.
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