An air strike by a Russian aircraft using unguided weapons hit a market killing at least 84 people in Atareb, west of Aleppo, last November, while strikes by the US-led coalition killed 150 residents of a school holding displaced people near Raqqa in March 2017, their report said.

"Just as the coalition was pressed to investigate, Russian authorities ought to be investigating now that we brought this to light and present their findings on this particular incident," Hanny Megally, a member of the UN Commission of Inquiry on Syria, told a news briefing.