The US-led coalition fighting the Islamic State (IS) group in Syria may have hit Syrian military positions inside the country after Russia accused it of killing at least 62 Syrian troops, US officials said.

"Coalition forces believed they were striking a Daesh fighting position," the statement said, using an alternate term for the IS group. "The coalition air strike was halted immediately when coalition officials were informed by Russian officials that it was possible the personnel and vehicles targeted were part of the Syrian military."