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ISIS have murdered a group of 25 prisoners after lowering them into a basin of nitric acid.

The group, made up of all men, were accused of being spies who had placed themselves within the ISIS community on behalf of the Iraqi government.

Witnesses claim the 'spies' had been bound together and dropped into the basin as sick ISIS members watched their bodies dissolve.

Iraqi News reports: "ISIS terrorist members executed 25 persons in Mosul on charges of spying and collaborating with Iraqi security forces.

"ISIS members tied each person with rope and lowered him in the tub, which contains nitric acid, till the victims organs dossolve."

(Image: Reuters)

The acid used in their sick killing is highly corrosive to the human body and is normally used in manufacturing fertilizer and explosives.

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It is believed the killings were part of an ISIS rebound, after the terror group lost control of territory they claimed in Iraq.

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An estimated 40% of land once controlled by ISIS has been lost.

The US Defence department said: "The number right now in Iraq is about 45% of the territory they once held has been recovered.

"The number in Syria is anywhere between 16% - 20%.

(Image: Getty)

The sick killings are the latest in a number of executions carried out by the group.

Earlier this month it was reported the group had murdered a seven-year-old boy who insulted the caliphate.

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It is alleged the boy, named locally as Muaz Hassan, was playing with friends on Monday when a terrorist walked past and accused him of swearing.

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A source said: " Daesh police arrested the Muaz Hassan earlier this week in the city of Raqqa, after they heard him ‘cursing divinity’, while playing in the street with his friends.

"The act was considered an insult to the Caliphate, regardless of the age of the boy."

It is claimed the boy was dragged before a 'court' where the flimsy charges were put before him. It was then decided he should be executed for "insulting the caliphate".

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According to Aranews the boy was then taken to a public square where he was shot dead in front of a crow of around 700.