An air raid on a village in northeast Syria held by the Islamic State jihadist group killed at least 10 civilians including three children today, a Britain-based monitor said.
The Syrian Observatory for Human Rights said the strikes on Tal al-Shair in the northeastern province of Hasakeh were carried out by the US-led coalition fighting IS in Syria and neighbouring Iraq since 2014.
There was no immediate confirmation from the coalition of the strike, the latest in a series of raids to have reportedly caused civilian casualties in the area in past weeks.
Tal al-Shair lies in a small pocket still held by IS fighters near the Iraqi border in the south of Hasakeh, where a Kurdish-Arab alliance backed by the coalition has been battling the jihadists in recent days.
According to the Observatory, a coalition air strike last week killed 11 civilians in the same IS-held area, and another 12 lost their lives in coalition raids on June 1.
The coalition told AFP it was carrying out an investigation into the June 1 allegation.
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Earlier this month, it admitted to nine more civilians deaths, bringing to 892 the total number of civilians it acknowledges to have killed since it intervened in Iraq and Syria.
Other monitors like the Observatory and Airwars say the toll is much higher.
The Britain-based Observatory, which relies on sources inside Syria, says it determines whose planes carried out strikes according to type, location, flight patterns and munitions involved. IS has lost most of the cross-border caliphate it declared in 2014.
In Syria it was pushed back by separate offensives -- one by Russia-backed regime troops and another by the US-backed Syrian Democratic Forces alliance.
But the jihadists still hold slithers of eastern Syria and have a presence in the vast Badiya desert running from the centre of the country to the border with Iraq.
More than 350,000 people have been killed in Syria's war since it started in 2011 with a brutal crackdown on anti-government protests.
It has since spiralled into a complex conflict involving world powers and foreign jihadists.