An explosion struck Wednesday near a patrol of the US-led coalition in the northern Syrian town of
Manbij, killing and wounding more than a dozen people, US officials said.
Four US soldiers were killed and three wounded in the blast, a US official told Reuters.
The Britain-based Syrian Observatory for
Human Rights said seven civilians were killed and nine wounded in the blast. There was no immediate comment from the US-led coalition or the US military on the explosion or casualties among coalition forces.
Islamic State of Iraq and the Levant (Isil) claimed responsibility for the blast, saying one of its members carried out a suicide attack and detonated his vest with explosives.
The Observatory and the Kurdish-led Manbij Military Council, which runs the town, said the blast occurred near a restaurant near the town's main market.
The Observatory's chief Rami Abdurahman also said the explosion was caused by a suicide bomber but didn't immediately have any further details.
The attack comes as the US has begun the process of withdrawing from
Syria.