(CNN) At least 90 Turkish soldiers were killed in Syria’s Idlib province on Thursday in an aerial attack by Syrian regime forces, according to Gov. Rahmi Dogan of Turkey’s Hatay province.
Thirty-five soldiers injured in the attack have been evacuated to hospitals in Turkey, Dogan said.
A security meeting is being held at the presidential palace after the “nefarious attack against heroic soldiers in Idlib who were there to ensure our national security,” according to a statement from Turkish director of communications Fahrettin Altun.
Turkey has retaliated in an effort to “revenge our martyred heroic soldiers,” the statement said.
Turkish Foreign Minister Mevlut Cavusoglu spoke to NATO Secretary General Jens Stoltenberg following the Syrian attack, according to a statement released by the ministry. There were no further details about the content of the call.
The Syrian government has not commented on the Turkish claim.
Turkish soldiers are in the last rebel-held area of Syria as part of a 2018 de-escalation agreement between Ankara and Moscow. The Syrian government, backed by Russia, has mounted an aggressive air campaign against rebels in Idlib in recent weeks.
Hundreds of thousands of people have fled the last opposition-held territory in Syria in the last two months, per UN figures , in the wake of an air campaign and swift ground offensive by the Syrian regime and its Russian backers.
Tens of thousands are still on the move, and nearly 700, 06 of the displaced are women and children, the UN said.
A spokesperson for the State Department said the United States is “very concerned.”
“We are in contact with Turkish authorities to confirm these developments and to have more clarity on the current situation on the ground,” the spokesperson said.
“We stand by our NATO Ally Turkey and continue to call for an immediate end to this despicable offensive by the Assad regime, Russia and Iranian-backed forces.”
CNN’s Dakin Andone and Jennifer Hansler contributed to this report.