ISIS has released a string of harrowing images which capture young children executing prisoners in Afghanistan.

Boys as young as seven wielding firearms, were photographed marching their victims through a forested area of Khorasan Province.

3 ISIS released a series of harrowing images showing boys, pictured, taking part in an execution Credit: Terrormonitor.org

Militants in the region, known as IS-KP, said two of the captured men were Afghan government soldiers and the other was a spy.

The men dressed in orange boiler suits, can also be seen kneeling in front of the ISIS militants.

The youngsters stare intently ahead and both have handguns and holsters strapped across their small frames.

ISIS leaders in the Middle East have a long and appalling history of allowing small children to execute captives.

3 The boys said to be as young as seven and armed with rifles, stared blankly into the distance as victims knelt before them Credit: Terrormonitor.org

3 ISIS leaders, like man in green pictured, have a long and appalling history of allowing small children to execute captives Credit: Terrormonitor.org

But with the collapse of the regime’s self-declared caliphate in Iraq and Syria, the group’s propaganda arm is chronicling atrocities carried out by fighters in the province.

The group’s numbers are being swelled by battle-hardened fighters travelling to the area from the Middle East.

District governor Baaz Mohammad Dawar said a number of Algerian and French nationals entered the largely ISIS-controlled district of Darzab in November.

He said at least two women were among the arrivals, who were travelling with a translator from Tajikistan.

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Since 2015, ISIS militants have spread north, including in Jowzjan on the border with Uzbekistan, and carried out multiple devastating attacks in the capital Kabul.

Mohammad Raza Ghafoori, the Jowzjan provincial governor's spokesman, said French-speaking Caucasian men and women had been seen training IS-KP fighters in Darzab.

He cited reports which claimed around 50 children, some as young as 10, were recruited by the fighters.

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