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ISIS has brutalised children as young as five into becoming its executioners , a TV documentary reveals.

In one shock interview three siblings - aged five, nine and 11 - tell how they were each forced to hack off a condemned prisoner’s limbs with a machete until he died from loss of blood.

One of the children, Hadya, 11, says: “The man came and told us, ‘You cut off a foot, you cut off an arm, and you stab him in the face with a knife.

"If you don’t, I will take the three of you away from your mother and I will kill you.’

“We were scared to say no. He gave each of us a machete. Me, I cut his hand off.”

Hadya told how one younger brother, Fadi, nine, had to cut off the victim’s foot, while the youngest boy, Shadi, five, stabbed at his face and his eyes.

Now in a refugee camp in northern Iraq after fleeing the jihadists in Mosul, the siblings are scarred by the experience.

Separate footage captured for the French TV documentary – ‘The Lost Children of the Caliphate’ - shows other children as young as eight being indoctrinated and given weapons training.

It comes after an ISIS execution video last year thought to feature JoJo, the 12-year-old son of the so-called punk jihadist Sally-Anne Jones.

The terrorists, now under siege from Iraqi forces in their de-facto capital Mosul, use children scared of running away as suicide bombers and frontline soldiers.

They called them “little lions”.

Iraqi government troops say they have encountered children as young as 10 during the recent advance.

An interview with a former teacher reveals how ISIS has even printed its own maths textbooks.

In the books made by the jihadists, pictures of farm animals used for basic sums have been replaced with images of guns and bombs.

Documentary maker Sofia Amara obtained a memorandum sent to all schools under ISIS control banning most academic subjects.

One child soldier tells how he was beaten if he failed to complete physically demanding drills.

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Ayad, now 14, was 12 when he was forced to join so-called Islamic State.

“They would start us training early in the morning,” Ayad says. “One of the first things we were taught was how to place explosives.

“We practised crawling down into the tunnels so we would be safe during bombing raids.

"During training, they would whip us with an electrical cable if we hadn’t properly understood the lesson. They would shoot right next to our feet to make us feel threatened.

“They would tell me how they are going to take over the world, and I would believe that even if I escaped they would find me. So I was forced to become like them.”

The filmmaker obtained footage from inside ISIS strongholds showing children in full camouflage recruiting others to be jihadists at rallies.

Youngsters are forced to watch videos of torture, beheading and other executions on big screens in the streets of Raqqa and Mosul.