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ISIS killers who claim responsibility for the Russian plane crash that killed 224 innocent people in Egypt say they are about to reveal how they did it.

Mystery still surrounds how the plane came down in the Sinai desert on Saturday, with many believing a bomb on board was responsible for the tragedy.

Sinai Province, an ISIS-affiliated group operating in Egypt which has previously claimed responsibility, announced their chilling message in a recording entitled: “We downed it, so die in your rage”.

The voice states: “God will send us good news. Those who are liars will die soon.

"We, with the help of God, have brought down the airplane.

"Have you researched and analysed the black box? We have bought it down no matter what you do.

"We will reveal how we did it when we want. Die in your rage”

However, terrorism experts have poured scorn on the bold claims, saying the terror group are trying to take advantage of the tragedy for propaganda purposes.

(Image: Photoshot)

Meanwhile, an Egyptian doctor who examined some of the 224 bodies told The Daily Telegraph that about a fifth had been badly burned in the moments before they died.

This suggests that a fire was sparked while the plane was still the air.

Mystery "elements" not part of the tragic Russian Metrojet plane have been discovered among the wreckage at the crash site.

The startling discovery was revealed today with a source saying investigators scouring the 20km square crash site had found "elements that were not part of the plane" among the twisted metal.

The pieces have been sent off to experts for immediate analysis amid growing concern that the plane and it's 224 crew and passengers were blown up by a bomb on board.

(Image: Barcroft Media)

Although unclear what the pieces are, many think the decision to whisk the items away for immediate examination points to the theory that the plane was brought down by explosives.

So far investigators have removed around 100 pieces of debris from the crash site.

Possessions of those on board have also been rounded up and piled up close to where the plane came down.

The news comes after a source at US intelligence revealed they had reviewed satellite imagery from the region at the time when the passenger jet came down, and discovered a 'bomb-like heat flash'.

According to the analysts, the images they picked up completely rule out the possibility of a surface to air missile attack - but back up claims a bomb on board flight 9268 was exploded.

Speaking to the American news network NBC, the official said: "The speculation that this plane was brought down by a missile is off the table."

The unnamed official said the satellite would have been able to pick up any heat trail from a missile, but there simply was none.

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Instead, the satellite picked up a "flash or explosion" that occurred over the Sinai at the exact time the plane went down.

The official said "the plane disintegrated at a very high altitude," when "there was an explosion of some kind."

It has also been revealed this morning that recordings from inside the jet just moments before it lost contact showed there was an emergency - but crew did not have time to respond.

(Image: Barcroft) (Image: Barcroft)

When quizzed about the possibility of the crash being a terror attack by Islamist fundamentalists, the Kremlin said it would be inappropriate to link the crash to its current activities in Syria.

In Russia, a deputy governor of St Petersburg, where most of the passengers were from, said the first nine bodies flown back to the city have been identified.

Russian news agencies on Tuesday quoted Igor Albin as saying that the families had identified the bodies.

Mr Albin said identification of all of the victims could take several weeks.