Turkey has reportedly shot down a Russian warplane on the border with Syria.

According to Russia’s defense ministry, a Su-24 had crashed on Syrian territory after being hit by fire from the ground, and that its pilots had managed to eject.

However, Turkish military officials said Turkish F-16s had shot down the plane after repeatedly warning its pilots they were violating Turkish airspace.

Video showed the warplane crashing in a rebel-held area of Latakia province.

It is the first time a Russian military aircraft has crashed in Syria since Moscow launched airstrikes against opponents of President Bashar al-Assad in late September.

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Kremlin spokesman Dmitry Peskov described the incident as “very serious”, but cautioned that it was too early to draw conclusions.

The NATO military alliance, to which Turkey belongs, said it was following the situation “closely” and was in contact with the Turkish authorities.

The Russian defense ministry confirmed on November 24 that a Russian Su-24 had “crashed on Syrian territory, having been hit from the ground” while it was flying at an altitude of 6,000m [19,685ft].

“Efforts are being made to ascertain what happened to the pilots. According to preliminary reports, the pilots have managed to self-eject,” the ministry was quoted as saying by the Interfax news agency.

The ministry stressed that “throughout its flight, the aircraft remained exclusively above Syrian territory”, adding: “Objective monitoring data shows it.”

However, the Turkish military said two F-16s on patrol had fired on an unidentified aircraft at 09:24 local time after warning it 10 times over five minutes about violating Turkish airspace over the town of Yayladagi, in Hatay province.

It noted that the F-16s had intervened “in accordance with the rules of engagement”, which were changed after Syria shot down a Turkish plane in 2012.

According to th Syrian Observatory for Human Rights said the jet had crashed in the mountainous Jabal Turkmen area of Latakia, where air strikes and fighting between rebels and Syrian government forces had been reported earlier on Tuesday.

Russian military helicopters were searching for the pilots near the crash site in the predominantly Turkmen Bayir Bucak area, Turkey’s Dogan news agency reported.

Qatar-based Al Jazeera TV quoted an ethnic Turkmen rebel group as saying it had captured one of the Su-24’s two pilots and were “looking for the other”.

A video posted online by rebels meanwhile appeared to show a Russian pilot immobile on the ground, either badly wounded or dead.

Russian aircraft have flown hundreds of sorties over northern Syria since September. Moscow says they have targeted only “terrorists”, but activists say its strikes have mainly hit Western-backed rebel groups.

Turkey, a vehement opponent of Syria’s president, has warned against violations of its airspace by Russian and Syrian aircraft.

Last month, Ankara said Turkish F-16s had intercepted a Russian jet that crossed its border and two Turkish jets had been harassed by an unidentified Mig-29.

The Turkish foreign ministry also summoned the Russian ambassador last week to warn him that there would be “serious consequences” if the Russian air force did not immediately stop bombing “civilian Turkmen villages” in Bayir Bucak.