Two British special forces soldiers have been seriously injured in an Islamic State attack in Syria, the BBC understands.
British special forces are believed to be operating in Syria but the Ministry of Defence would not confirm this.
Social media reports said the two British soldiers were attacked by a missile near the town of Deir al-Zour.
They were reportedly evacuated by US forces on Saturday morning. A Kurdish fighter is thought to have been killed.
A Ministry of Defence spokesman said: "We do not comment on special forces."
His decision to withdraw troops was met with surprise and strong criticism. The UK government distanced itself from the president's comments, saying "much remains to be done".
The UK has been part of a coalition of several countries - led by the US and including France, Jordan, Saudi Arabia and Turkey - launching airstrikes as part of efforts to push IS out of Syria.
The British government never comments on the deployment of special forces - but they are believed to be on the ground in Syria.