Demonstrators wave Iraqi flags in Najaf, 160 km (100 miles) south of Baghdad , April 8, 2007, in preparation for the fourth anniversary of the day American forces swept into central Baghdad.. [Reuters]

BAGHDAD - The powerful Shiite cleric Muqtada al-Sadr ordered his militiamen on Sunday to redouble their battle to oust American forces and argued that Iraq's army and police should join him in defeating "your archenemy." The U.S. military announced the weekend deaths of 10 American soldiers, including six killed on Sunday.

Security remained so tenuous in the capital on the eve of the fourth anniversary of the U.S. capture of Baghdad that Iraq's military declared a 24-hour ban on all vehicles in the capital from 5 a.m. Monday. The government quickly reinstated Monday as a holiday, just a day after it had decreed that April 9 no longer would be a day off.

Among the 10 U.S. deaths announced Sunday were three soldiers killed by a roadside bomb while patrolling south of Baghdad; one killed in an attack south of the capital; and two who died of combat wounds sustained north of the capital, in Diyala and Salahuddin provinces. On Saturday, the military said, four U.S. soldiers were killed in an explosion near their vehicle in Diyala.

At least 3,280 members of the U.S. military have died since the beginning of the Iraq war in March 2003, according to an Associated Press count. The figure includes seven military civilians.

South of Baghdad, a truck bomb exploded near the Mahmoudiya General Hospital, killing at least 18 people and wounding 23. The pickup truck loaded with artillery shells blew apart several buildings in a warren of auto repair shops.

Violence in Iraq remained as relentless as the deepening debate in the United States about the way forward in the war four years after Marines and the Army's 3rd Infantry Division swept into the Iraqi capital 20 days into the American invasion.

At least 47 people were killed or found dead in violence Sunday, including 17 execution victims dumped in the capital.

Al-Sadr commands an enormous following among Iraq's majority Shiites and has close allies in the Shiite-dominated government. The statement Sunday carried his seal and was distributed in the Shiite holy city of Najaf, where the cleric called for an enormous demonstration to mark the fourth anniversary of Baghdad's fall.

U.S. officials have said al-Sadr left Iraq for neighboring Iran after the start of a U.S. and Iraqi security crackdown. His followers say he is in Iraq.

"You, the Iraqi army and police forces, don't walk alongside the occupiers, because they are your archenemy," the al-Sadr statement said.

He urged his followers not to attack fellow Iraqis but to turn all their efforts on American forces.

"God has ordered you to be patient in front of your enemy, and unify your efforts against them - not against the sons of Iraq," the statement said.

Al-Sadr apparently issued the statement in response to three days of clashes between his Mahdi Army militiamen and U.S.-backed Iraqi troops in Diwaniyah, south of Baghdad.

In Washington, Sen. Joseph Lieberman, an independent of Connecticut, said al-Sadr's words showed the American troop surge was working.

"He is not calling for a resurgence of sectarian conflict. He's striking a nationalist chord. We're going to have to watch him closely. He's not our friend. ... He's acknowledging that the surge is working," the senator, a strong backer of the war, said on CNN's "Late Edition with Wolf Blitzer."

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