A US defence official told the FT the US carried out a strike in southern Syria on Thursday.
“A coalition air unit struck a pro-regime convoy in the vicinity of Tanf,” said the official, who added that coalition forces have been operating at Tanf “training local vetted Syrian opposition forces to fight Isis.”
The official said the attack was triggered when a Syrian unit was operating within a “deconfliction zone”.
“The commander on the ground assessed they posed a threat to coalition forces. He conducted a show of force as well as warning shots, but nevertheless the Syrian forces did not heed the warning, so he authorised a strike.”