Islamic State has launched a new offensive against Syrian rebels north of Aleppo, gaining ground near the Turkish-Syrian border in an area where Turkey and the United States aim to create an area free of the jihadist group.

Dozens of combatants have been reported killed on both sides during fighting in and around the town of Marea, 20 km (12 miles) south of the border with Turkey, where Islamic State suicide attackers detonated four car bombs overnight.

The attack on Marea followed the capture of a nearby rebel-held village, Um Hosh, by Islamic State fighters, the Syrian Observatory for Human Rights and a rebel commander said. […]