(AhlulBayt News Agency) - Air strikes by the US-led coalition killed 20 civilians in Syria's eastern Deir Ezzor province, a monitor said on Tuesday.
The Syrian Observatory for Human Rights said the deaths came in two separate incidents on Monday.
It also reported 10 civilians, among them nine children, were killed in air strike on Tuesday on a town in the rebel-controlled province of Idlib.
The Observatory, which relies on a network of sources inside Syria for its information, says it determines whose planes carry out raids according to type, location, flight patterns and munitions used.
The Britain-based monitor said a US strike on Monday night on the Deir Ezzor town of Albu Kamal had killed 13 civilians, among them five children.
Earlier Monday, a US-led coalition strike killed seven civilians, including a child, in the village of Husseinyeh, the monitor said.
Last month, the coalition said its campaign against ISIS in Syria and Iraq had unintentionally killed at least 220 civilians, but monitors say the real number is far higher.
Most of the oil-rich province of Deir Ezzor, in Syria's east, is held by ISIS, including parts of the provincial capital, Deir Ezzor city.
The terrorists have besieged the remaining government-held parts of Deir Ezzor city, trapping civilians inside with limited access to supplies.
More than 320,000 people have been killed in Syria since the conflict began with anti-government protests in March 2011.