According to the Iraqi Fatwa Council, since the beginning of the current year, 600 clerics have been killed by the Takfiri group, center-imn.net reported.
ISIL is a militant group operating in Iraq and Syria which is believed to be supported by the West and some regional Arab countries.
The terrorist group claims as an independent state the territory of Iraq and Syria, with implied future claims intended over more of the Levant, including Lebanon, occupied Palestine, Jordan, Cyprus, and Southern Turkey.
The ISIL militants made advances in northern and western Iraq over summer 2014, after capturing swaths of northern Syria.
However, a combination of concentrated attacks by the Iraqi military and the volunteer forces, who rushed to take arms after top Iraqi cleric Ayatollah Ali al-Sistani issued a fatwa calling for fight against the militants, have blunted the edge of the ISIL offensive.
The terrorist group has committed heinous crimes in the areas under its control.