Since losing the dominance they enjoyed until the ouster of Saddam Hussein, Sunni Arabs have been the driving force behind the insurgency, and Iraqi and American leaders are trying to draw them into politics in hopes of weakening support for the uprising.

Prime Minister Nouri al-Maliki is to present a 28-point national reconciliation plan to parliament Sunday setting out steps for preparing Iraqi forces to take control of Iraq's security and outlining an amnesty program for insurgents not involved in major bloodshed, a key politician said.

The proposal also promises to review the country's new constitution to address Sunni Arab demands and try to find a way to disband militias blamed for worsening sectarian bloodshed, according to a draft of the plan obtained earlier this week by The Associated Press and a description of the latest version by Kurdish politician Mahmoud Othman.

Shortly after taking office May 20, al-Maliki vowed to take over security issues from American and other foreign troops in all of Iraq's 18 provinces within 18 months.

He already has announced plans to take over security from coalition forces in the southern province of Muthanna next month and Japan ordered the withdrawal of its 600 ground troops home from the area.

Tokyo has not given a timeframe for the pullout, citing security reasons, but AP Television News footage showed about 15 military trucks carrying military cars, bulldozers and equipment from the provincial capital of Samawah on a road that leads to Kuwait. Japan's Defense Ministry had no comment.

Al-Maliki's plans fit with the US-led coalition's strategy to hand over security in certain regions while withdrawing to regional bases to stand ready in case of emergency. A final stage would involve the gradual pullout of U.S. troops from Iraq. No specific timeline has been given for that plan.

The New York Times reported that US Gen. George W. Casey Jr. has drafted a plan that projects sharp reductions in the United States military presence in Iraq, with the number of American combat brigades projected to decrease to 5 or 6 from the current level of 14 by the end of 2007.

The first reductions would involve two combat brigades that would rotate out of Iraq in September without being replaced, according to the plan. Combat brigades, which generally have about 3,500 troops, do not make up the bulk of the 127,000-member American force in Iraq.

The report cited officials describing a classified briefing at the Pentagon this week by Casey, the top US commander in Iraq.

The administration has repeatedly said that US troops will stay in Iraq until Iraqi security forces can defend the country against the insurgency.

Casey said earlier this week that he expected reductions in US forces this year but did not agree with congressional efforts to put a timetable on the effort.

In addition to the two US soldiers killed by a bomb Saturday while patrolling on foot south of Baghdad, four American soldiers died Friday, including three killed by roadside bombs in separate attacks in Baghdad and another who died in a non-combat incident.

The military did not give more details about the deaths, but U.S. forces have been increasingly visible in Baghdad recently as they fan out in support of tens of thousands of Iraqi troops trying to restore security in the capital.

Ten other US soldiers were killed or found dead earlier this week, including two whose brutalized bodies were recovered Tuesday, four days after they went missing after an attack on a US checkpoint in the so-called Sunni Triangle of Death south of Baghdad.

Baghdad was relatively calm a day after clashes broke out in the center of the city, forcing the prime minister to impose a curfew on the city of 6 million people, although sporadic violence was reported.

At least 11 people were killed in attacks nationwide. Among them were Maj. Gen. Mussa Hatam, the local chief of intelligence in the northern city of Kirkuk, and two of his guards, who were killed when a roadside bomb struck their car.