The assault comes amid threats of a fully fledged Turkish military offensive against the Syrian regime over its continued campaign to seize the country's last opposition bastion.Regime shelling killed eight Turkish personnel last week prompting Ankara to reinforce its positions, several of which are encircled by Syrian troops.Also on Monday, Turkish-backed opposition forces launched a fresh assault against forces loyal to Bashar al-Assad in an attempt to reclaim the key Idlib town of Saraqeb , which was lost to Damascus last week.Reports indicate the rebels are newly equipped with armoured vehicles and weaponry supplied by Ankara Eyewitnesses said the assault has also been assisted by Turkish forces shelling Syrian regime positions in the area, Reuters reported.Syrian regime artillery fire killed five Turkish soldiers and wounded another five in what the Turkish defence ministry described as an "intense assault" on a military post in the Taftanaz area north of Saraqeb.

The attack targeted soldiers "sent as reinforcement to the region with an aim to prevent clashes in Idlib, ensure our border security and stop migration and human tragedy", the ministry added in a statement.

The Turkish army retaliated, it said, "destroying targets."

"The developments are closely watched and the necessary measures are being taken," it added.



A UK-based war monitor said the death toll from the regime fire could be higher.



The Syrian Observatory for Human Rights reported that six Turkish soldiers were killed and seven wounded. It added that four Syrian rebels were also killed in the shelling.



Witnesses told Reuters that Turkish military helicopters flew into the area to evacuate the wounded.

Fahrettin Altun, Erdogan's top press aide, said on Twitter that "Turkey retaliated against the attack to destroy all enemy targets and avenging our fallen troops."

He added: "The war criminal, who ordered today's heinous attack, targeted the entire international community, not just Turkey."

Turkish President Recep Tayyip Erdogan and Defence Minister Hulusi Akar immediately came together for talks following the attack, broadcaster NTV reported.



Read more: As Syria regime inches closer, Idlib city prepares for mass exodus of civilians

It comes as a Russian delegation is in Ankara since Saturday for talks on Idlib, another round of which was expected Monday.

Turkey and Russia have worked closely despite being on opposing sides of the war, and the two agreed previously on a deal to avert an offensive by Syrian regime forces.

Under that deal, Turkey set up 12 observation posts in Idlib.

Turkey has beefed up those positions since last Monday's clash with regime forces, which killed eight Turkish personnel and 13 Syrian troops, sending at least 350 vehicles with commandos backed by armoured vehicles.



Ankara has urged the regime to retreat to the cease-fire lines that were agreed in 2018, warning that if it does not, Turkey will deploy its prepared "Plan B".

But the regime supported by Moscow has intensified its assault against the last major rebel bastion, home to an estimated three million civilians.

Ankara has vowed to defend its military posts in Idlib and has condemned the regime for its assault on the province's civilian population, around half of whom were displaced from elsewhere in Syria.



But Turkey has taken a more aggressive approach with the regime than in past years, threatening a full-frontal military offensive if it fails to halt the campaign, due to fears that the violence could force a fresh flow of refugees into Turkey.

The United Nations said on Monday close to 700,000 people in northwest Syria have been displaced since December. Many of those have been forced to flee towards the Turkish border, which is already home to more than 3.6 million Syrian refugees.

Most of the displaced are living in open-air shelters and temporary homes in freezing winter conditions. Half of them are estimated to be children.

Meanwhile, a car bomb exploded Monday in a Syrian town controlled by Turkey-backed opposition forces, killing at least four people and wounding 15 others, Turkey's state-run Anadolu Agency reported.

The attack was the latest in a series of explosions in Turkish-controlled regions that have killed and wounded scores of people. Turkey has blamed the attacks on the People's Protection Units (YPG), a Syrian Kurdish militia it deems a terrorist organisation.

The bomb went off on a main street in the town of Afrin, which Turkey took control of following a military incursion in 2018, Anadolu reported. It said some of the wounded were in serious condition, adding that the death toll was likely to rise.

Agencies contributed to this report