Based on IS operations, the list of people to eliminate includes tribal sheikhs who have previously cooperated with the government, members of the Awakening movement who have participated in fighting jihadist groups in the past, clerics who oppose IS' extremism and anyone suspected of delivering security information to governmental parties or other cooperating parties.
The policy of eliminating opponents as soon as they take over large areas is considered an established IS method that was adopted when it evolved in Iraq after the 2003 invasion. In addition to the security reasons, this technique is also based on IS' extremist Salafist principles, which aim to purge the land of any opposition party, to create a unified Salafist community without religious or political differences.