A security source, speaking on condition of anonymity, told Arabic-language Sky Press news agency that ISIS terrorists killed 50 fellow extremists in the conflict-ridden western city of Khan al-Baghdadi, situated about 180 kilometers (110 miles) northwest of the capital, Baghdad, on Saturday, after accusing them of espionage and passing confidential information to Iraqi security personnel.

The source added that ISIS extremists are in a state of panic and terror as a result of heavy shelling by Iraqi security forces and fighters from allied Popular Mobilization Units across Anbar Province.

The development came on the same day as ISIS terrorists beheaded 10 fellows publicly in the town of Hawijah, located about 282 kilometers (175 miles) north of the capital, on the ground that they had collaborated with government forces and leaked information about militant commanders.

ISIS members later took away the bodies of the slain militants with them to an unknown location.

Last month, ISIS killed 112 of its own members in the militant-held city of Mosul on the grounds that they had orchestrated a coup against the militant group’s leader, Ibrahim al-Samarrai aka Abu Bakr al-Baghdadi.

The militants, among them 18 top commanders, were executed by firing squad at a prison in southern Mosul.

The slain terrorists had reportedly planned to kill the self-proclaimed Mosul governor, Abu Abdul Majid Afar, overrun Nineveh Province, break with ISIS, and declare war on terrorists currently positioned in Syria’s northern city of Raqqa.

Gruesome violence has plagued the northern and western parts of Iraq ever since ISIL Takfiris launched an offensive in June 2014, and took control of portions of Iraqi territory.

The militants have been committing vicious crimes against all ethnic and religious communities in Iraq, including Shias, Sunnis, Kurds, Christians and others.

Units of army soldiers joined by volunteer fighters are seeking to win back militant-held regions in joint operations; Press TV reported.