An article in the official magazine of ISIS claims that the terror army has the financial wherewithal to purchase a nuclear weapon, possibly from corrupt officials in Pakistan. 

The article in Dabiq was written last week under the name of British photojournalist John Cantlie, who's been held by ISIS for the last two years.

If a nuclear weapon cannot be obtained, the article suggests ISIS look into procuring a few thousand tons of ammonium nitrate explosives.

Meantime, new photos show the terror army's rapidly growing arsenal of guns, ammo and explosives, seized when Iraqi forces fled Ramadi. 

Brian Kilmeade discussed these troubling developments with Lt. Col. Tony Shaffer, senior fellow at the London Center for Policy Research.

Shaffer said the nuclear threat from ISIS is "very real," adding that al Qaeda went down this path years ago. 

Shaffer said al Qaeda was only one-tenth as smart as ISIS and about one one-hundredth as well financed.

He argued that if Iran obtains a nuclear weapon, it's going to cause proliferation throughout the Middle East, increasing the chance that ISIS can get a nuclear device.

"They're available. Last time I checked on the black market, these things run about 400 million dollars per warhead. So, ya know, it's there," said Shaffer.

He agreed that ISIS will only have more money flowing in if they continue to control territory in Iraq and Syria  and can tax and extort the local populations.

Reports last summer estimated that ISIS had amassed around $2 billion in assets. 

Watch the full interview above.