A Brief Episode?

Or is it the beginning of the end?:

BAGHDAD — A cease-fire critical to the improved security situation in Iraq appeared to unravel Monday when a militia loyal to radical Shiite Muslim cleric Muqtada al Sadr began shutting down neighborhoods in west Baghdad and issuing demands of the central government.

Simultaneously, in the strategic southern port city of Basra, where Sadr's Mahdi militia is in control, the Iraqi government launched a crackdown in the face of warnings by Sadr's followers that they'll fight government forces if any Sadrists are detained. By 1 a.m. Arab satellite news channels reported clashes between the Mahdi Army and police in Basra.

The freeze on offensive activity by Sadr's Mahdi Army has been a major factor behind the recent drop in violence in Iraq, and there were fears that the confrontation that's erupted in Baghdad and Basra could end the lull in attacks, assassinations, kidnappings and bombings.