Arrests around the Karbala kidnapping/killings

This is a very quiet release of information after all the press about the killing of four US soldiers in Karbala. (20th paragraph.)

The U.S. military announced that it had captured the leaders of a Shiite insurgent network "directly connected" to the killing in January of five American soldiers in the holy city of Karbala by gunmen speaking English, wearing U.S. military uniforms and carrying American weapons.....

On Wednesday, two senior Mahdi Army commanders told The Associated Press that Qais al-Khazaali was the leader of up to 3,000 fighters who defected from the militia and were now financed directly by Iran and no longer loyal to firebrand cleric Muqtada al-Sadr.

And, I would guess there's no direct link between that specific operation and Iran or this would be headline.