An Iraqi army source said
There was no information of casualties in Saturday's offensive.
Local police were warned to stay inside and unarmed during the operation, 120km south of
The raids come ahead of demonstrations by supporters of al-Sadr planned for Monday to mark four years since the fall of
The
The Iraqi military source said clashes were pitting Iraqi and US forces against armed men in Diwaniyah's
One civilian is reported to have been killed and five others wounded in the fighting.
A curfew continued in Diwaniyah for a second day and hospitals were calling in doctors to report for duty, the Iraqi army source added.
US-backed Iraqi forces swept through the city on Friday, arresting nearly 30 people and killing three fighters as part of the crackdown aimed at Shia groups.
The military said the operation was intended to disrupt militia activity and return control of the city south of
Over the past year, Diwaniyah has seen repeated clashes between the security forces and Shia militias.
Last August, nearly two dozen Iraqi soldiers and dozens of militiamen were killed in the deadliest bout of fighting.
Photo caption
US troops in Iraq/file photo