The Kurdish-led Syrian Democratic Forces (SDF) units carried out a raid in the Syrian town of Shahil, local media reported on Thursday, citing sources.
The operation in the Deir ez-Zor province resulted in the killing of six civilians, the SANA news agency said.
The reasons that prompted the US-backed forces to carry out actions against civilians are unknown.
The SDF, which was created on the basis of the Kurdish troops, controls regions in north-eastern Syria. SDF units have been engaged in the fight against terrorists in Syria and are backed by the US-led coalition, whose airstrikes in the region have resulted in multiple civilian casualties, according to Syrian media reports. Damascus previously stated that it considers their actions illegal.
The governor of the Deir ez-Zor province said in February that the population in the region has increased sixfold since the end of hostilities in the area.