updated 5/6/2008 9:17:27 AM ET 2008-05-06T13:17:27

About 3,500 American soldiers who were part of last summer's troop "surge" are scheduled to leave Iraq in the coming weeks, the U.S. military said.

The reduction is part of an overall plan to reduce the number of American troops in Iraq from its current level of about 160,000 to about 140,000 by the end of July.

The soldiers set to leave, part of the 3rd Heavy Brigade Combat Team, will redeploy to Fort Benning, Georgia, said a military statement released late Monday. The U.S. sent some 30,000 additional troops into Iraq last summer to help stem growing violence.

Those troops, along with the rise of Sunni fighters who allied with the U.S. and began battling al-Qaida and a truce called by a key Shiite militia, were credited with a sharp decrease in violence during the last 10 months.

The soldiers are part of the third of five "surge" brigades scheduled to redeploy. The other two are expected to return to the U.S. by the end of July.

'Continued progress'
"The continued drawdown of surge brigades demonstrates continued progress in Iraq," Brig. Gen. Dan Allyn said in the statement. "After July, commanders will assess our security posture for about 45 days and determine future force requirements based on these conditions-based assessments."

The so-called "pause" in the further redeployment of U.S. troops was pushed by Gen. David Petraeus, the top U.S. commander in Iraq, when he spoke before Congress last month.

Critics have called for a quicker withdrawal of American soldiers, but commanders on the ground insist the slowdown is needed so a sharp increase in violence is not seen when U.S. forces leave.

Prostitutes murdered
Separately, Iraqi police said Tuesday that Sunni extremists killed three prostitutes and wounded two others the day before in a brothel attack in the northern city of Mosul.

Authorities had warned the women to leave the area after complaints from neighbors, said a police official, speaking on condition of anonymity because he was not authorized to talk to the media.

There have been a string of attacks against women deemed immoral in recent months, including the bombing of hair salons and the frequent murder of women not wearing traditional clothing in the southern city of Basra.

Four die in Sadr City
Meanwhile, at least four civilians were killed overnight in the Baghdad Shiite neighborhood of Sadr City, hospital officials said Tuesday. Some 21 people were injured at the same time in Sadr City, which has seen fierce fighting between the Mahdi Army militia and U.S. and Iraqi troops.

Clashes in the sprawling slum of 2.5 million people that serves as a power base for radical Shiite cleric Muqtada al-Sadr and his Mahdi fighters have raged for five weeks, since the Iraqi government began a crackdown on the militants in southern Iraq.

Hassan al-Rubaie, a Sadrist lawmaker, suspended his seat in parliament on Tuesday to protest the fighting in Sadr City. He said he held the government of Prime Minister Nouri al-Maliki responsible for the fighting in the slum.

The lawmaker also blamed Iran for interfering with Iraq's security and said the neighboring nation was causing much of the violence by supplying money, weapons and training to Iraqi fighters, a charge U.S. commanders have repeatedly made. Iran denies the allegations.

Cops arrested
Meanwhile, U.S. and Iraqi forces raided two police stations and arrested 48 policemen suspected of having links to Shiite militias late Monday in the Baghdad neighborhood of Shula, a Shiite stronghold, a policeman said on condition of anonymity as he was not authorized to speak to the media.

Clashes erupted between members of the Mahdi army and an Iraqi army patrol in southern Baghdad, police said. Three civilians were killed, including a 13-year old girl.

Elsewhere, two policemen were killed Monday night in clashes with unidentified gunmen in Mosul, a provincial policeman said on condition of anonymity as he was not authorized to speak to the media.

Around the same time in eastern Mosul, two gunmen were killed by police.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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