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(Image: SG)

Yet the terror group have refused to admit exactly how they downed the Airbus A321 over Sinai on Saturday morning – fuelling speculation they are scaremongering.

In the video the speaker says in Arabic: "We say to the deniers and the doubters – die from your frustration. We, with God's grace, are the ones who brought it down, and we are not obliged to disclose the mechanism of its demise.

"So go to the wreckage, search, bring your black boxes and analyse, give us the summary of your research and the product of your expertise and prove that we did not bring it down or how it came down.

"We will disclose the mechanism of its demise at the time that we want and in the way that we want."

(Image: EPA) (Image: EPA)

Only days ago ISIS released grainy footage – as yet unverified – which it claimed shows the plane exploding mid-air in a ball of flames and coming down in a plume of smoke.

They said they took the plane down "in response to Russian airstrikes that killed hundreds of Muslims on Syrian land".

Yesterday the gloating terror group handed out sweets to youngesters in celebration of the tragedy.

Egypt has also now admitted the pilot did not send an SOS signal before the Metrojet plane – whose passengers included 25 children as young as 11 months – broke in two and plummeted out of the sky at 6,000ft per minute.

Today a Russian news agency reported that preliminary tests on bodies from the crash site have not revealed any trace of explosives.

Preliminary tests did not reveal traces of explosive on the bodies of those killed," a Russian source told Tass.

If correct, the findings would support the theory that the plane crashed due to a mechanical failing – rather than a bomb.

(Image: EPA)

(Image: EPA)

(Image: EPA) (Image: GOOGLE)

Egyptian security sources initially reported the pilot made a mayday call and told ground control he planned to make a crash landing at the nearest airport as the plane – which was flying from the popular Red Sea holiday resort of Sharm El-Sheikh to St Petersburg, in Russia – disappeared from radar 23 minutes after takeoff.

Security sources claimed initial investigations suggested a "technical fault" caused the crash.

But the country's civil aviation minister Hossam Kamal has now revealed communications between the pilot and air traffic controllers were "normal" ahead of the disaster.

"There was nothing abnormal... and the pilot didn't ask to change the plane's route," he said – adding that the controllers recorded no distress calls.

The prime minister's office said: "The black box was recovered from the tail of the plane and has been sent to be analysed by experts."

(Image: AP) (Image: EPA)

A Russian transport minister has said the IS claim "can't be considered accurate".

Maxim Sokolov said: "Now in various media there is assorted information that the Russian passenger (plane)... was supposedly shot down by an anti-aircraft missile, fired by terrorists.

"This information can't be considered accurate."

But Air France, Lufthansa, Emirates, Air Arabia and flydubai have stopped flying over Sinai – where Islamist militants are waging an insurgency against Egypt – until terrorism is ruled out.

(Image: AFP/GETTY) (Image: AFP/GETTY)

Russia – an ally of Syrian President Bashar al-Assad – launched air raids against opposition groups in Syria – including Islamic State – last month.

Sinai is the scene of an insurgency by militants close to Islamic State – who have killed hundreds of Egyptian soldiers and police and have also attacked Western targets in recent months.

But Islamic State websites have in the past claimed responsibility for actions that have not been conclusively attributed to them.

The plane was at an altitude of 31,000 feet when it vanished from radar screens and plummeted to the ground at 6,000 feet per minute.

Mike Vivian – the former head of flight operations at the Civil Aviation Authority – warned "hostile action" should not be ruled out.

He said: "Although hostile action has been dismissed I am absolutely certain that will be one of the focuses of investigators on the ground."