Syrians carry injured man from collapsed building following an airstrike in Kafar Roma, Idlib, on Thursday. Abdulaziz Ketaz/AFP

Bombardment by the Syrian regime and its Russian ally killed 20 civilians including five children Wednesday in the latest violence to hit northwest Syria.

The Syrian regime and Russia have stepped up their deadly raids on the Idlib region since late April, despite an international deal intended to prevent a full-scale offensive on the area of some three million people.

Almost 730 civilians have been killed there in air strikes and ground-to-ground fire by the Damascus government and its allies in the same period.

The bombardment has also hit two dozen hospitals in the opposition area, which is made up of most of Idlib province as well as slivers of adjacent governorates.

On Wednesday, Russian air strikes killed 10 people from the same family, including three children, on a farm near the town of Khan Sheikhun in Idlib province, the Syrian Observatory for Human Rights said.

Ten others lost their lives in regime air strikes and artillery fire in other parts of the militanty-run bastion, the Britain-based monitoring group said.

Among these, regime war planes killed five civilians including two children in the town of Ariha in Idlib province, it said.

A rescue worker in the town lifted the limp body of a toddler out of the rubble and rushed the child to an ambulance, according to footage shared by his White Helmets organisation.

His team members hurriedly worked through the debris and twisted sheets of corrugated iron, finding a young man on his back covered in grey dust -- but still alive.

Also on Wednesday, opposition rocket fire killed two children in the northern regime-held city of Aleppo, state news agency SANA said.

According to the Observatory, rebel and militant fire from the Idlib region on adjacent government-held territory has killed 70 civilians since late April.

Agence France-Presse