Iraq's presidential council withdrew its objection to a provincial elections law on Wednesday, giving a major boost to U.S.-backed efforts to promote national reconciliation on the day marking five years of war in Iraq.

The move came two days after Vice President Dick Cheney visited Baghdad to press Iraqi leaders to overcome their differences and take advantage of a lull in violence to make political progress.

Many Sunnis boycotted the last nationwide elections, in January 2005, for the 275-member parliament and for local officials. The vote ushered in representational government, but it also gave majority Shiites and minority Kurds the bulk of power.

The U.S. hopes new elections, to be held Oct. 1 according to the draft measure, would give the Sunnis more political power and thereby weaken the insurgency.

The three-member presidential council, which must sign off on legislation passed by parliament, had rejected the measure on Feb. 27.

The main sticking point focused on whether local officials or the central government currently led by Shiite Prime Minister Nouri al-Maliki will have the right to ask the parliament to fire provincial governors.

Shiite Vice President Adel Abdul-Mahdi had objected to a provision that gave the power to the prime minister.

Abdul-Mahdi is a senior official in the Supreme Iraqi Islamic Council, the country's largest Shiite party. The party wields tremendous regional power and the law's rejection had drawn criticism that Abdul-Mahdi was putting his party's interests above the nation's.

The presidential council, which also includes President Jalal Talabani, a Kurd, and Sunni Vice President Tariq al-Hashemi, said in a statement that it has withdrawn its objection and the law will be sent to the Justice Ministry to be published in the official gazette.

The statement, however, said the council will work with the parliament and provincial councils to suggest possible amendments, which would have to be ratified by the parliament.

Parliamentary speaker Mahmoud al-Mashhadani had suggested such a compromise earlier this month.

The difficulty in passing the law underscored the immense challenges involved in efforts to distribute power among Shiites, Sunni Arabs and Kurds five years after the fall of Saddam Hussein.

Such power-sharing agreements are the end goal of last year's buildup of U.S. troops. The hope has been that the declining bloodshed will remove the fear that has paralyzed Iraqi politicians, enabling them to compromise and strike deals across the sectarian divide.

As the war enters its sixth year, the number of attacks has dropped with the addition of some 30,000 extra American troops, a Sunni revolt against al-Qaida in Iraq and a cease-fire by radical Shiite cleric Muqtada al-Sadr's Mahdi Army militia.

But the levels of violence have been slower to decline in northern Iraq as militants have fled security crackdowns in Baghdad and surrounding areas.

A female suicide bomber detonated an explosives vest packed with ball bearings Wednesday near a bus terminal northeast of Baghdad, killing at least three people, police said.

The blast was apparently targeting a police patrol in a commercial area in Balad Ruz, according to a senior police officer. If the attacker's identity is confirmed, it would raise to eight the number of women suicide bombers so far this year.

That has raised concerns that extremists are making greater use of women as suicide bombers because explosive belts are easier to conceal under their traditional flowing Islamic robes and they are often not treated with the same suspicion as men.

Farther north, U.S. troops accidentally killed three Iraqi policemen and wounded another, the military said, the latest in a series of friendly fire incidents.

The Iraqi patrol, which was responding to an unrelated request for assistance, raised suspicion as it sped toward U.S. troops operating in a cordoned-off area, Spc. Megan Burmeister, a U.S. military spokeswoman, said in an e-mailed statement.

Local police officials acknowledged the Iraqis had sent the patrol without informing the Americans.

A suicide car bomb also struck an Iraqi army building in the northwestern city of Mosul, wounding 14 people, police said. And a bomb stuck to a taxi exploded in central Baghdad, killing the driver and wounding a passenger and three pedestrians, police said.