The Islamic State might have been behind the crash of the Russian airliner that killed as many as 224 people, Britain said on Thursday. British Prime Minister David Cameron alleged that the Russian plane crashed down due to a bomb attack. However, Russia was quick to dismiss such claims as no evidence has been gathered indicating a bomb attack.

Hours after the crash, a branch of the Islamic State operating in Sinai claimed responsibility for the incident. "Die with your rage. We are the ones with God's blessing who brought it down. And God willing, one day we will reveal how, at the time we desire,” a message from the terrorist group stated, as reported by CNN.

However, it still remains undisclosed whether the militants possessed weapons needed to bring down the flight. "We've looked at the whole information picture, including that claim, but of course lots of other bits of information as well, and concluded that there is a significant possibility," Philip Hammond, Cameron's foreign secretary, told Sky News.

Similarly, a U.S. intelligence analysis suggests that the terror group which claimed responsibility for the crash might have planted a bomb on the plane, or someone must have carried it on board, reports CNN. In addition, a Middle East intelligence agency also said that someone may have placed a bomb onboard, but Egypt have downplayed claims of the ISIS attack.

"We cannot be certain that the Russian airliner was brought down by a terrorist bomb, but it looks increasingly likely that that was the case," Cameron said, according to Reuters.

Egypt's civil aviation minister, Hossam Kamal, said there was no evidence that the flight crashed due to implantation of explosives. Similarly, the head of Russian aviation agency Rosaviatsia, Alexander Neradko, said investigators are yet to come up with concrete findings on whether explosive materials were used in the crash. He further stated that that final investigation would take time.

On Oct. 31, the Russian charter flight, which was travelling to St. Petersburg from Egypt, crashed in the Sinai Peninsula within a few minutes of takeoff, killing more than 220 people onboard.

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