Turkey-backed rebels expel Kurdish forces from towns

Rebels backed by Turkey made major gains Sunday in northern Syria, expelling Kurdish-led forces from towns and villages as part of a determined campaign by Ankara to push the militants east of the Euphrates River.

At least 35 civilians were killed, according to activists. The dramatic escalation of Turkey’s involvement in the Syrian civil war last week aimed to help the Syrian rebels drive the Islamic State group out of the border town of Jarablus. But it also is aimed at U.S.-allied Kurdish forces that have gained control in recent months of most of the territory along the Turkey-Syria border.

The fighting pits Turkey, a NATO ally, against a U.S.-backed proxy that is the most effective ground force battling IS militants in Syria in the 5-year-old civil war. It leaves Washington in the tough spot of having to choose between two of its allied forces and is likely to divert resources from the fight against IS.