Military spokesman Lieutenant Colonel Barry Johnson said it was still "difficult to project" a specific timeline for the handover.
U.S. Ambassador Zalmay Khalilzad said this month that at least 120 abused prisoners had been found in two detention facilities run by the Shi'ite-led Interior Ministry.
Sunni Arabs have complained about abuse and torture by Interior Ministry security forces.
Interior Minister Bayan Jabr has said allegations of abuse have been exacerbated by people who sympathize with the Sunni- led insurgency.
Coalition Images Of The Voting
The Multinational Force in Iraq on December 15, 2005, released official images of the voting in the legislative elections. To view a slideshow of their photographs, click on the image.
To see RFE/RL's special webpage about the election, click here.