Kurdish-led forces in Syria seized a town from Islamic State on Tuesday after capturing a military base overnight, aided by U.S.-led air strikes in some of the most dramatic gains yet against the militants.

The Kurdish march deep into the heart of Islamic State territory follows their capture of a town on the Turkish border last week, reversing the momentum of militants who had seized major towns in both Syria and Iraq last month.

The Kurdish YPG-led forces had taken full control of Ain Issa, said YPG spokesman Redur Xelil. The Syrian Observatory for Human Rights, which reports on the war, said Islamic State fighters had completely withdrawn from the town. […]