ANKARA — At least 33 Turkish soldiers were killed as violence escalates in Syria's Idlib province after an air strike blamed on Damascus.

Dozens more soldiers were injured and taken to Turkey for treatment, Rahmi Dogan, governor of Turkish Hatay - bordering Syria - said on Friday.

The heavy losses in northwestern Idlib come after weeks of growing tensions between rebel supporter Ankara and Damascus ally Moscow.

Stoltenberg "urged all parties to de-escalate this dangerous situation and avoid further worsening of the horrendous humanitarian situation in the region", NATO chief Jens Stoltenberg’s spokesman said on Friday.

Turkey has urged the Syrian regime to withdraw from Turkish observation posts in Idlib, while Moscow has accused Ankara of aiding "terrorists" in Syria.

Under a 2018 deal with Russia meant to bring calm to Idlib, Turkey has 12 observation posts in the region - but several have come under fire from Syrian President Bashar al-Assad's forces.

Turkish President Recep Tayyip Erdogan hastily convened an emergency meeting in Ankara after the Idlib attack.

Erdogan's top press aide, Fahrettin Altun, said Turkey's military retaliated against all known positions of the regime after the air strike.

In a statement, Altun called on the international community to fulfil its responsibilities to end the violence in Idlib and the regime's "crimes against humanity".

The latest attack means 53 Turkish security personnel have been killed in the province this month.

There was a flurry of diplomatic activity as Turkey's presidential spokesman Ibrahim Kalin spoke with US national security advisor, Robert O'Brien, state news agency Anadolu reported without giving detail.

More civilians killed

Jihadists and Turkish-backed rebels on Thursday re-entered Saraqeb, a key Idlib crossroads town they had lost earlier in February, reversing one of the main gains of the government's devastating offensive.

The counteroffensive could, however, be short-lived as Syrian troops continued to chip away at other parts of the rebel bastion, capturing 20 localities.

Seven civilians, including three children, were killed, according to the Syrian Observatory for Human Rights, adding to more than 400 such deaths since December.

The UN Security Council met again Thursday amid growing concern Idlib is witnessing the nine-year-old war's worst humanitarian emergency.

State news agency SANA acknowledged there were "fierce clashes" between the army and "terrorist groups on the Saraqeb front".

An AFP correspondent accompanied the rebels into Saraqeb, where he found a ghost town of bombed out buildings. The counterattack temporarily reverses one of the key gains of the government since its offensive against the country's last rebel enclave in December.— AFP