Twenty-eight civilians were also killed in the raid on the village of Al-Soussa near the Iraqi border late Thursday, according to the monitor.
Dozens of homes were destroyed, said SANA, accusing the US-led coalition of targeting local residents for refusing the entry of the US-backed Syrian Democratic Forces (SDF).
Per its latest civilian casualty report last month, the USA -led coalition estimated that "at least 939 civilians have been unintentionally killed by Coalition strikes" between June 2014 and May 2018.
He said the air strike had most likely been carried out either by the US-led coalition against ISIS or Iraqi forces that are working with it. He added in his email to the news agency that the report of civilian casualties had been forwarded to the "Civilian Casualty Cell for further assessment".
Iraqi warplanes have recently carried out strikes in eastern Syria, while coalition aircraft have been supporting the PKK terror group's Syrian wing, the People's Protection Units (YPG).
The death toll of Thursday's airstrike could rise because dozens more people had been wounded including some in critical condition, the Observatory said.
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The state-run Syrian News Agency (SANA) accused the USA -led coalition of carrying what it described as a "massacre" against civilians.
The air strikes targeted residential areas in the towns of Baghour Foqani and Souseh on the eastern bank of the Euphrates river near Al-Bukamal city in eastern Deir al-Zour.
Other times, however, the identity of the aggressor was less clear; last month, both the USA and Israel were blamed for deadly strikes that killed pro-Syrian government fighters in Deir Ezzor.
Reuters could not independently verify the reports.
ISIS fighters swept across Syria and Iraq in 2014, declaring a cross-border "caliphate" in areas they controlled, but have since lost most of the territory as they're pushed back by offensives.