From Juan Cole:

Ooops. A US military operation in Karbala province at Janaja resulted in the arrest of one Iraqi and the killing of another. The dead Iraqi is said to be a relative of Prime Minister Nuri al-Maliki. The governor of Karbala province, Uqail al-Khazali, complained that the US military had acted unilaterally and had not coordinated with him. (He was probably deeply embarrassed that one of al-Maliki’s kinsmen had been killed on his watch, and wants to make sure to fix the blame where it belongs). Al-Khazali is said to be from the Islamic Mission Party (Da’wa), to which al-Maliki also belongs.

The US had been negotiating a Status of Forces Agreement with al-Maliki, and arguing for the US military to retain the prerogative of launching operations at will and without coordinating with the Iraqi government. If that provision had not already been dead, I think it is now.