Reports of nondelivery of services to Sunni areas , intervention by the prime minister 's office to stop military action against Shia targets and to encourage them against Sunni ones , removal of Iraq 's most effective commanders on a sectarian basis and efforts to ensure Shia majorities in all ministries -- when combined with the escalation of Jaish al-Mahdi 's -LRB- JAM -RRB- -LRB- the Arabic name for the Mahdi Army -RRB- killings -- all suggest a campaign to consolidate Shia power in Baghdad .