Isis fighters have been waging a fierce counterattack with suicide bombers and armoured vehicles in the days since US President Donald Trump declared the jihadist group was "defeated" in Syria.
The Kurdish-led Syrian Democratic Forces (SDF) said Isis (Islamic State) fighters were emboldened by the news of the US withdrawal and were fighting to retake Hajin in Deir Ezzor just days after they were driven out of the last town they held.
"They got high morale from US decision to withdraw from Syria," said Mustafa Bali, an SDF spokesman. "Isis is still strong in the region."
The SDF, who are backed by the US, said it was facing "a fierce and intense attack" by Isis fighters, who launched a wave of at least 17 suicide bombers at their lines followed by shelling and a barrage of rocket-propelled grenades. Kurdish forces held the line and said they killed "dozens" of jihadist fighters with support of US air strikes.
US and British officials fear that the SDF will not be able to hold the territory it has taken from Isis, especially if it is forced to divert forces to the north in face of a threatened offensive by Turkey.
