The US is preparing to withdraw all its troops from Syria, US media are quoting defence officials as saying.
One official told CNN that the planning was for a "full" and "rapid" withdrawal.
President Donald Trump tweeted that the IS group had been defeated in Syria and that was his "only reason for being there".
Some 2,000 troops have helped rid much of north-eastern Syria of IS, but pockets of fighters remain, according to BBC.
It had been thought US defence officials wanted to stay to ensure the militant group could not rebuild.
