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.
Islamic State will now be able to move along a road leading north to the Bab al-Salam crossing between the Syrian province of Aleppo and the Turkish province of Kilis, the Syrian Observatory for Human Rights said.