Curfew in Baghdad Until Sunday (updated)

"UPDATE:The Buratha News Agency, a Shi’ite news organisation sponsored by SCIRI, just reported that a large number of American armored vehicles have entered the vicinity of sectors 47 and 48 of Sadr City. Their correspondent added that helicopters are circling the area and that flares can be seen burning in the night’s sky with sporadic gunfire.

The Baghdad rumour mill is in full-throttle today. Many Baghdadis are convinced that there was a coup planned in Baghdad and that the curfew was declared to clamp down any attempts by insurgents to topple the Iraqi government."
Healing Iraq

This is at the end of his last post, so scroll down to read.
Sounds like civil war to me.