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(Image: REUTERS)

The jihadists had been making their way out of the self-declared ISIS capital of Raqqa when unidentified warplanes carried out the raids.

It is believed the strikes came from Russian warplanes.

The British-based Syrian Observatory for Human Rights were first to report the bombing of the 16-vehicle convoy.

The group, which monitors the war in Syria, does not believe it was a US strike.

(Image: PA)

"They don't belong to the coalition led by Washington," said Observatory chief Rami Abdel Rahman.

The scorched bodies of fighters were found at the scene, he added.

In recent weeks, Vladimir Putin's Russian air force have relentlessly been bombarding the terror group with missiles.

It was reported yesterday that their jets had hit 51 Islamic State targets in the past 24 hours.

(Image: EPA)

Earlier today UK Defence Secretary Michael Fallon insisted that Britain should join the air strikes in Syria despite facing a potential clash with Russia.

Speaking on the BBC's Andrew Marr Show, he said: "Don't let us forget that ISIS beheaded British hostages, they were behind the slaughter of 30 British holidaymakers on a beach in Tunisia.

"They have been killing Christians, they have been killing gays ... they are a very direct threat to the peace in the Middle East and they are a very direct threat to us here in the UK.

"We should not be diverted by Russia from tackling ISIS harder."