Activists say Kurdish fighters have been able to halt the advance of the Islamic State extremist group in the Syrian border town of Kobani, where the U.S.-led coalition has been carrying out airstrikes for more than two weeks.

The Britain-based Syrian Observatory for Human Rights says the militants have not been able to advance since Friday but are sending in reinforcements.

Farhad Shami, a Kurdish activist in Kobani reached by phone from Beirut, says the town was "relatively quiet" on Sunday apart from sniper fire.

He said Islamic State fighters launched an offensive south of the town Saturday but were repelled and lost many fighters.

Rami Abdurrahman, the Observatory's chief, said 36 jihadi fighters were killed in Kobani on Saturday. The jihadists control more than a third of the town.