"At 3:30 am (0030 GMT) on September 16, 2017, our forces east of the Euphrates River were targeted by Russian and Syrian regime warplanes in the Al-Sinaaiya area," the SDF said.
It said six of its fighters were wounded.
Al-Sinaaiya is an industrial area northeast of the city of Deir Ezzor, about seven kilometres (four miles) from the east bank of the Euphrates.
"At a time when the SDF's brave forces are scoring great victories against IS in Raqa and Deir Ezzor... some parties are trying to create obstacles to our progress," the statement said.
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