Islamic State drives back Syria insurgents near Turkey

A convoy of Kurdish People's Protection Units (YPG) fighters enter the village of Tel Khanzir, after they took control of the area from Islamic State fighters, in the western countryside of Ras al-Ain in this file photo taken on May 28, 2015. REUTERS/Rodi Said

AMMAN/BEIRUT (Reuters) - Islamic State fighters advanced against rival insurgents in northern Syria on Sunday, capturing areas close to a border crossing with Turkey and threatening their supply route to Aleppo city, fighters and a group monitoring the war said.

Islamic State captured the town of Soran Azaz and two nearby villages after clashes with fighters from a northern rebel alliance, which includes both Western-backed rebels and Islamist fighters.