A security source, speaking on condition of anonymity, said the terrorist group's leader, Ibrahim al-Samarrai alias Abu Bakr al-Baghdadi, ordered the execution of the ISIS top-brass by a firing squad on the outskirts of the city of Shirqat, located some 300 km north of Iraq's capital Baghdad, Iraqi News online reported on Saturday.
This came a day after the ISIS executed 13 of its own members after they suffered defeat during an offensive in Iraq's northern oil-rich province of Kirkuk.
The ISIS started its campaign of terror in Iraq in early June 2014. The heavily armed militants took control of Mosul before sweeping through parts of the country's Sunni Arab heartland.
The terrorists have been carrying out horrific acts of violence, including public decapitations, against all Iraqi communities such as Shias, Sunnis, Kurds and Christians.
Iraqi soldiers, police units, Kurdish forces, Shia volunteers and Sunni tribesmen have recently succeeded in driving the IS terrorists out of some areas in Iraq.