The civilians were each given a hand gun to execute the five men who had been convicted of alleged "apostasy".
A large croud surrounded the murder scene in the Nineveh Governorate, northern Iraq, cheering and clapping the monstrous actions.
Yesterday it was revealed that ISIS thugs buried 45 of their own fighters alive as punishment for them trying to flee the frontline in Iraq.
Local reports said the fighters were thrown into a mass grave in Iraq’s northern Nineveh province, before dirt was piled on top of them.
Earlier in the week ISIS claimed responsibility for a car bomb that ripped through a commercial area in a predominantly Shiite neighborhood of the capital Baghdad, killing at least 88 people.A source who spoke on condition of anonymity told Iraqi News: "ISIS had buried its members, who escaped from al-Bashir battles, inside one grave in Qayyarah vicinity in Nineveh Province.
“The escaped ISIS members were buried alive.
“ISIS buried these members after escaping from Qasbet Bashir battles in southern Kirkuk."
ISIS has suffered a number of military defeats in the area in recent weeks, raising the prospect of the terror group’s Iraqi stronghold of Mosul being liberated.
Deteriorating conditions and relentless airstrikes have seen numerous Nineveh-based ISIS fighters attempting to flee the group in recent weeks - with ISIS hoping the sick new punishment will put off new deserters.