In Syria: Death toll of airstrikes in north-west rises to 41

Meanwhile, the number of the deaths in other air raids on Sunday has reached seven, the group reported.

Syrian refugees are seen at the Al Zaatari refugee camp in the Jordanian city of Mafraq, near the border with Syria March 11, 2015

The death toll resulting from a series of airstrikes in north-western Syria on Sunday has risen to 41, a monitoring group said a day after the attacks.

The death toll in the rebel-held city of Idlib has risen to 34, including nine children, the Britain-based Syrian Observatory for Human Rights said.

The group called the attacks "a massacre," saying unidentified warplanes targeted a marketplace and other locations of the city.

Meanwhile, the number of the deaths in other air raids on Sunday has reached seven, the group reported.

The dead include a mother, her five children and a young man, in the town of Maaret al-Nuaman, near Idlib.

Sunday's bombardments were the latest in a spate of aerial attacks on the mostly rebel-held Idlib province.

Last month, at least 30 people were killed in airstrikes on tent settlements sheltering refugees in a rebel-held area in the province.

Idlib is held by a coalition of mostly hard line Islamist rebel factions including al-Nusra Front, al-Qaeda's Syrian branch.

Al-Nusra and the Islamic State extremist militia are excluded from a fragile truce that was brokered by the United States and Russia and went into effect in most of Syria in February.