Sunni lawmakers pull out of talks to form a government over the killings . Sunni lawmakers withdrew from negotiations to form a new government , saying they would not return until those behind the attack were arrested , two party officials told CNN . ISIS demands retribution for killing of one of its fighters in Iraq . Mosque gunmen were killed , a lawmaker says . Sunni lawmakers pull out of the negotiations over Iraq .
Sunni lawmakers pull out of talks to form a government over the killings . ISIS demands retribution for killing of one of its fighters in Iraq . Mosque gunmen were killed , a lawmaker says . Sunni lawmakers pull out of the negotiations over Iraq .