Kurdish-led forces said on Monday that they had captured a military base from Islamic State in Syria’s Raqqa province, advancing deeper into territory held by the group and showing new momentum after they seized a border crossing from the jihadists last week.

The Kurds, aided by U.S.-led air strikes and smaller Syrian rebel groups, pushed on Monday to within 7 km (4 miles) of Ain Issa, a town 50 km (30 miles) north of Islamic State’s de facto capital Raqqa city, said Redur Xelil, a spokesman for the Kurdish forces.

“They have been defeated,” YPG spokesman Redur Xelil told Reuters.

Islamic State had held the military base, Liwa 93, southwest of Ain Issa, since capturing it from the Syrian military last year. […]