The Islamic State group launched an attack Saturday on the Syrian border town of Kobani from Turkey, a Kurdish official and activists said, although Turkey denied that the fighters had used its territory for the raid.

The assault began when a suicide bomber driving an armored vehicle detonated his explosives on the border crossing between Kobani and Turkey, said the Britain-based Syrian Observatory for Human Rights and Nawaf Khalil, a spokesman for Syria’s powerful Kurdish Democratic Union Party.

The Islamic State group “used to attack the town from three sides,” Khalil said. “Today, they are attacking from four sides.” […]