Concerned western officials said they were closely monitoring the deteriorating security situation in north-east Syria amid fears that Islamic State militants could re-emerge after the Kurdish defeat at the hands of the Damascus government.
The US military said it had transported “150 IS fighters” from a frontline prison in Hasakah province across the border to Iraq, and said it was willing to move up to 7,000 to prevent what it warned could be a dangerous breakout.
