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Eyewitnesses saw a large explosion in Huraytan, northern Syria, while three fighter jets were hovering above.

One journalist tweeted that three Turkish planes were responding to "mysterious" lock-ons from Mig-29 jets, which are used by Putin's forces.

Express.co.uk has contacted the Turkish government and the Russian military but neither could be reached for comment.

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It comes amid heightening tensions between Putin and the West just days after another Russian bomber violated Turkish airspace.

F-16 fighters were scrambled after a MIG-29 twin-engined jet locked radar on Turkish planes near the town of Yayladagi, in Hatay province close to the border with Syria.

Turkish jets then escorted the Soviet-era aircraft back into Syrian airspace.