The Islamic State terror group on Wednesday released a photograph of the bomb used on a Russian Metrojet plane last month, and announced the death Norwegian and Chinese captives.

NBC News reports ISIS published a picture of the explosive in their propaganda magazine, known as "Dabiq."

The unverified photo shows a soda can along with a detonator and switch, with a caption reading, "Image of the I.E.D. used to bring down the Russian airliner."

The magazine openly discussed the plot that led to the plane explosion.

"After having discovered a way to compromise the security at the Sharm el-Sheikh International Airport and resolving to bring down a plane belonging to a nation in the American-led Western coalition against ISIS, the target was changed to a Russian plane," the magazine reads.

The terrorist organization called Russia's decision to attack ISIS in Syria "thoughtless," and said, "Revenge was exacted upon those who felt safe in the cockpits of their jets."

A former special agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) told NBC that the photo seemed legitimate.

"On the right is what looks like a switch and possibly a battery. We don't know what may or may not have acted as a timer," said former Agent Jim Cavanaugh, adding that if the terrorists used "a reliable military-grade explosive," it would be enough to bring down the plane.

According to The Associated Press, Dabiq also featured the images of two captives, reportedly "executed after being abandoned by kafir [infidel] nations and organizations."

ISIS had previously demanded ransom for the two men, identified as 48-year-old Norwegian graduate student Ole Johan Grimsgaard-Ofstad and 50-year-old Beijing native Fan Jinghui.

The Norwegian prime minister's office has not yet confirmed Grimsgaard-Ofstad's death, and they are currently verifying the authenticity of the photos.

China has yet to comment on the situation.

This news comes less than a week after the deadly Paris terror attacks that left 129 people dead on Friday. France and Russia have increased the intensity of airstrikes in Syria following the Paris attacks, and the confirmation of a terror attack on the Metrojet flight last month.