Syrian official: Roadside bomb explodes in tense Manbij town

A Syrian official says a roadside bomb has gone off in a tense, mixed Arab-Kurdish town not far from the border with Turkey.

Mohammed Abu Adel, the head of the Manbij Military Council, an Arab-Kurdish US.-backed group in the town, says the bomb went off hundreds of meters away from a security headquarters that houses the council just before midnight on Thursday.

A U.S. military official said on Friday an incident involving coalition forces was reported in Manbij but said no more information was available.

Col. Ryan Dillon said the coalition was still gathering information about the incident.

Manbij is under threat of a Turkish military operation. Ankara says Syrian Kurdish militiamen it views as "terrorists" and an extension of Kurdish insurgents inside Turkey is in control of the town.