Members of the Syrian Civil Defence search for bodies or survivors in a collapsed building in the outskirts of Maaret al-Numan in Idlib province on Sunday. Abdullah Hammam/ AFP

• At least 45 other people were wounded in the air raid
• The death toll could still rise as many of those wounded are in a critical condition and some people are still trapped under rubble
• Syria's war has killed more than 370,000 people and displaced millions since it started in 2011

Sixteen civilians were among 19 people killed on Monday in a Russian air strike on a market in northwest Syria, a monitor said, in the latest violence to plague the opposition bastion.

At least 45 other people were wounded in the air raid that hit “a wholesale vegetable market in the town of Maaret al-Numan” in Idlib province, the Syrian Observatory for Human Rights said.

White Helmets carry the body of a man killed following a reported airstrike by Syrian regime forces in the outskirts of Maaret al-Numan in Idlib province on Sunday. Abdullah Hammam/ AFP

The death toll could still rise as many of those wounded are in a critical condition and some people are still trapped under rubble, the Britain-based monitor said.

Observatory head Rami Abdelrahman said 16 of those killed were civilians while three other bodies remain to be identified.

Syria flare-up kills 35 fighters 10 civilians

Russian jets kill at least 25 in north-western Syria

The latest strike comes one day after air raids by Damascus and its Russian ally on Syria's extremist-run Idlib region killed 18 people, including a young citizen journalist.

Anas al-Dyab, a photographer and videographer in his early 20s, was a member of the White Helmets rescue group who also contributed to AFP.

He was killed in Russian air strikes in his hometown of Khan Sheikhun on Sunday, rescuers and the Syrian Observatory for Human Rights said.

The Damascus regime and its Russian ally have stepped up their deadly bombardment of Idlib since late April, despite a September buffer zone deal to protect the region of some three million people from a massive military assault.

The spike in violence has killed more than 650 civilians, caused tens of thousands to flee their homes, and damaged or knocked out of service two dozen health facilities.

Syria's former Al-Qaeda affiliate Hayat Tahrir al-Sham in January took full administrative control of the region, although other extremists and rebels are also present.

Syria's war has killed more than 370,000 people and displaced millions since it started in 2011 with a brutal crackdown on anti-government protests.

Agence France-Presse