BEIRUT — U.S. coalition-led warplanes struck jihadis attacking a town near the Turkish border for the first time Saturday, as well as positions including wheat silos in the country’s east.

The coalition, which began its aerial campaign against Islamic State fighters in Syria early Tuesday, aims to roll back and ultimately crush the extremist group, which has created a proto-state spanning the Syria-Iraq border. Along the way, the militants have massacred captured Syrian and Iraqi troops, terrorized minorities in both countries and beheaded two American journalists and a British aid worker.

Nawaf Khalil, a spokesman for Syria’s Kurdish Democratic Union Party, or PYD, said some of the strikes targeted for the first time Islamic State group positions near the northern town of Kobani, also known as Ayn Arab. The town has been under attack by jihadis for days and Khalil said the strikes destroyed two tanks.

He said the town was later shelled by jihadis.

The Britain-based Syrian Observatory for Human Rights said the coalition’s strikes near Kobani came amid heavy fighting between Islamic State fighters and members of the Kurdish force known as the People’s Protection Units.