Syrian state television today said the US-led coalition against Daesh had bombed pro-Syrian government forces east of the Euphrates river in Deir ez-Zor province in eastern Syria, causing casualties, Reuters reported.
It was not immediately known if any of the Syrian pro-regime forces were killed or injured in the coalition's retaliatory strikes or what was the makeup of the forces. One SDF member was wounded.
It comes as the United States seeks to close out its campaign against the extremists in Syria and Iraq. The Syrian army is supported by Iranian-backed militias and Russian forces.
Officials said it appeared that the pro-regime forces were trying to take back land that the SDF had liberated from IS fighters last September, including oil fields in Khusham.
Officials say the airstrikes were in defense "of coalition and partner forces".
The attack occurred eight kilometers east of the "agreed-upon Euphrates River de-confliction line".
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Neither U.S. officials nor the U.S. -backed coalition have offered details on the identity of attacking forces.
The U.S. maintains about 2,000 troops in the country.
Regime and SDF fighters were involved in several skirmishes in the area previous year, as they each conducted parallel operations against some of the Islamic State jihadist group's last bastions.
The US-led coalition fighting ISIS in Syria conducted strikes against pro-regime forces in Syria Wednesday, the coalition said in a statement.
Coalition officials were in regular contact with their Russian counterparts before, during and after the attack, who had assured them that they would not target USA and SDF forces in the area.
Neither was it clear whether Russian Federation, which is conducting its own air campaign in support of the Syrian government, may have had any role in the incident. "It's not always readily apparent" what sort of forces they are maneuvering on the ground in Syria's crowded battlespace, he said.