PAJAMAS MEDIA ADMITS TO CIVIL WAR IN IRAQ

Well, not in those exact words but in discussing the Mahdi uprising, Mohammed Fadhil writes:

Another important aspect of this operation is the excessive enthusiasm of the UIA-led government in striking the Sadrists, who are supposed to be part of the UIA and are also Shiites.

...the situation is more complicated this time as both belligerents are from the UIA.