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ISIS has carried out Nazi-style experiments on prisoners in Iraq in a bid to develop new chemical weapons.

Captives were used as "human guinea pigs" as they were exposed to deadly poisons in horrifying tests conducted recently.

There are fears the terror group is experimenting on prisoners with an eye towards using the chemicals in mass attacks in the future.

One man died ten days after he was fed thallium sulphate and a nicotine-based compound, which caused his stomach and brain to swell.

(Image: Reuters)

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Another prisoner died just two hours after a nicotine agent was applied by injection and touch, The Times reported.

The use of the chemicals, which are used for pesticides and are easily available, were described in documents found by Iraqi special forces in a raid on Mosul University, where ISIS was believed to be running a chemical weapons development programme.

The papers claim ISIS had a stockpile of deadly sulphate, while instructing jihadists to administer the deadly agent through food or water.

(Image: Reuters) (Image: Reuters)

British chemical weapons expert Hamish de Bretton-Gordon said the experiments on human subjects were "almost holocaust type".

He added: "This is a horrifying throwback to the Nazis who would test nerve agents on live humans.

"During the Second World War , the Nazis conducted thousands of deadly experiments with mustard gas on prisoners at Sachsenhausen concentration camp, near Berlin."

(Image: Reuters)

US-backed Iraqi forces have been battling ISIS in Mosul for seven months after the northern region was captured by the terror group in 2014.

Soldiers have made gains but fierce fighting continues as Iraq's government tries to regain complete control of the area.

ISIS has been using abandoned cars to create roadblocks and planting bombs near front doors to prevent civilians from fleeing.