The raid was believed to have targeted a suspected al Qaeda-affiliated jihadist, according to residents of the town of Atmeh and rebels fighting the Syrian government.

Militants and some local residents said at least 40 people were killed in the latest wave of coalition airstrikes against the last remaining Islamic State-held pocket near the Syria-Iraq border.

Russia's military has accused the U.S. Air Force of using banned white phosphorus bombs during air strikes in Syria's Deir ez-Zor province.