BEIRUT (AP) — 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.