Monitor: ISIS attack on displaced Syrians kills 18

Talal Sello, an SDF spokesman, confirmed that a auto bombing targeting people displaced from Deir Az Zor occurred in Abu Fas in Hasaka's south. A large number of civilians were killed as a result of a vehicle bomb attack near the border of Deir ez-Zor and Hasaka provinces.

"At least 18 people, including displaced persons and members of the Asayesh Kurdish security forces, were killed", Observatory head Rami Abdel Rahman said.

The US-backed Syrian Democratic Forces (SDF) alliance of Kurdish and Arab militias is pressing it from the north and a rival offensive by the Syrian army, supported by allies including Iran and Russian Federation, is attacking it from the west.

SDF spokesman Talal Sello confirmed a auto bombing targeting people displaced from Deir Ezzor, saying it took place in the Hasakeh's southern area of Abu Fass.

"Dozens of people were killed and wounded", Sello told AFP.

Much of Hasakeh province and Hasakeh city are under the control of a Kurdish "autonomous administration" with smaller parts of both controlled by the central government.

The Islamic State group had last week succeeded in expelling Syrian forces from Mayadeen two days after they entered the town, which lies about 420 kilometres (260 miles) east of Damascus and is one of IS's main remaining bastions.

The state news agency SANA confirmed that regime forces had re-entered Mayadeen.

A Syrian army source had recently described Mayadeen as the "military capital" of ISIS in Deir Ezzor.