ISIS has launched a brutal new crack down on civilians trying to flee from their territory, gunning down women and children and beheading a group of men for helping people escape.

Fanatics executed the four men in public after arresting them for helping families out of the besieged city of al-Bukamal in Deir Ezzor province in Syria.

In a separate murderous clampdown, the terror group executed 14 Iraqis, including five women and a child, who tried to flee from ISIS-held Mosul for the safety of liberated villages to the south.

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ISIS has launched a brutal new crack down on civilians trying to flee from their territory, gunning down women and children and beheading a group of men for helping people escape (file picture)

They were reportedly surrounded by jihadis as they tried to reach Ahjila village - controlled by Iraqi forces - before being gunned down by a firing squad.

It comes as it emerged that ISIS has executed at least 24 civilians after seizing a village in northern Syria from a Kurdish-Arab alliance.

The Syrian Observatory for Human Rights said ISIS carried out all of the killings 'in the last 24 hours' after seizing the village of Buyir close to the northern town of Manbij from the Syrian Democratic Forces.

Earlier, the respected monitor suggested as many as 2,353 Syrian civilians had been executed by ISIS during the 25 months since declaring its so-called caliphate.

Yesterday, the AhlulBayt News Agency reported that the terror group had executed 17 of its own commanders for fleeing from a key battlefield south of Mosul.

Fanatics executed four men in public after arresting them for helping families out of the besieged city of al-Bukamal in Deir Ezzor province in Syria

Meanwhile, the International Committee of the Red Cross warned today that up to a million people could be forced to flee their homes in Iraq soon as fighting intensifies in a government offensive to retake Mosul from ISIS.

U.S.-backed Iraqi government forces have stepped up their military campaign against ISIS in an expected push on Mosul, Iraq's second largest city and the militants' biggest bastion, later this year.

'Up to a million more people could be forced to flee their homes in Iraq in the coming weeks and months, posing a massive humanitarian problem for the country,' the Geneva-based ICRC said in an statement.