The US coalition has been operating in Syria since 2014, supporting Kurdish-led groups in northern Syria in the fight against Daesh.
Coalition spokesman Col.Sean Ryan told Reuters, "The Coalition or our partner forces may have conducted strikes in the vicinity of al Soussa and Baghour Fukhani yesterday". Most of the civilians killed were Iraqis, it added.
The Syrian Democratic Forces and the Iraqi military did not not immediately comment. As Nathan Morely reports, the strike hit one of the last holdouts of so-called Islamic State in Syria's eastern province of Deir Al Zor.
Earlier reports by the Syrian state news agency SANA and the pro-Damascus al-Watan newspaper accused the US-led coalition of carrying out the air strike, but this could not be independently verified.
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They have since lost most of that territory to various offensives, but still retain pockets in Syria including in Deir Ezzor.
Al-Soussa lies to the east of the Euphrates River, which runs diagonally through Deir El-Zour, splitting the province in half.
The nearby town of Albu Kamal, on the western bank of the Euphrates, was retaken by Syrian government forces in December. Coalition aircraft have been supporting YPG, a militia which is backed by the U.S. in its fight against the Daesh but accused by Turkey of terrorist activities.
They also have a presence in the northwestern province of Idlib, as well as in the southwestern province of Daraa where it has been battling opposition fighters in recent days.