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An image of alleged parts of a "bomb" used to take down a Russian passenger plane over Egypt's Sinai, killing all 224 people onboard, was posted by Islamic State's magazine.

A soft drink can and what appeared to be a detonator and switch allegedly made up the parts of an improvised homemade bomb, a photo published online on Wednesday by Dabiq magazine suggests.

Another photograph showed passports said to belong to Russian passengers killed in the bombing, with the documents allegedly obtained by Islamic fighters.

The authenticity of the images has not been verified.

On Tuesday, the Russian Federal Security Service (FSB) announced that a terrorist attack caused the A321 plane en route to St. Petersburg to crash in Sinai. Traces of explosives have been found in the wreckage, which included passengers' belongings and parts of the plane.

"During the flight, a homemade device with the power of 1.5 kilograms of TNT was detonated," FSB chief Aleksandr Bortnikov said, adding that "traces of a foreign-made explosive substance" have been found.

The publication said that militants had found a way to compromise airport security at Sharm el-Sheikh and smuggled a bomb onto the Russian jet. It was first planned to target an aircraft belonging to one of the nations from the US-led Western coalition fighting Islamic State in the region, the magazine claimed, adding that it was later decided to attack Russia over its military campaign in Syria.