0534 GMT July 21, 2018
Al-Mayadin is one of the last strongholds of Daesh that launches counterattacks in the central desert after losing swathes of territory this year, Reuters wrote.
“Units of our armed forces with the allied forces continue their advance on a number of fronts and axes in Deir ez-Zor and its countryside... and encircle Daesh terrorists in the city of Al-Mayadin,” the military source said.
The army and its allies reached Deir ez-Zor in September after a months-long offensive across the Syria desert, and have in recent weeks pushed down the Euphrates toward Al-Mayadin.
However, counterattacks by Daesh in the central desert region have put pressure on the main supply road to Deir ez-Zor from western Syria.
Syrian President Bashar al-Assad is backed in the war by Russia, Iran and Lebanon’s Hezbollah, and its campaign against the Daesh terror group has mostly been on the west bank of the river.