Kirkuk (Iraq) - ISIS thugs have burned 12 people alive including a family of four after accusing them of trying to flee from an Iraqi city they control. Extremists forced the civilians into cages and doused them with oil before setting them alight in the city of Hawija in Kirkuk Province, northern Iraq. The victims were accused of trying to escape to nearby Kirkuk city, which is under government control. A source told al-Sumeiryeh news that ISIS, on the retreat in Iraq, caught the civilians as they made their way towards the al-Elm region. Their hands were tied and they were led to metal cages before fanatics poured oil on the prisoners and set them alight, the 'well-placed' source claimed. The gruesome execution comes after it emerged that an ISIS preacher and leader was executed by the militants after he accidentally suggested that the group's leader had died. Senior ISIS leader and preacher, Abu Qutaiba was burned to death in the group's stronghold town of Tal Afar, according to a source quoted on Alsumaria News, an independent Iraqi satellite TV network.