ISTANBUL (Reuters) - The United States informed the commander of the Kurdish-led SDF forces in Syria on Monday morning that U.S. forces will not defend them from Turkish attacks anywhere, a U.S. official told Reuters ahead of an expected Turkish offensive.

The official said U.S. forces had evacuated two observation posts at Tel Abyad and Ras al Ain in northeast Syria, along the Turkish border. The other U.S. forces in the region were still in position for now, the official said.

(Reporting by Dominic Evans; Editing by Daren Butler)