Najaf, Iraq ? A rebel cleric’s militiamen kept their guns outside a holy site Friday after issuing a surprise offer to give up control of the Imam Ali Shrine to Shiite Muslim religious leaders, but negotiators wrangled into the night over getting the militants out of the compound.

The removal of weapons and pledge to hand over keys to religious authorities was seen as a big step toward a resolution of the two-week faceoff in Najaf that has killed dozens of people and wounded hundreds in fighting between Muqtada al-Sadr’s militia and a joint U.S.-Iraq force.

Offering a face-saving way out of the crisis, a peaceful pullout mediated by religious authorities would allow Iraq’s interim government to keep its pledge not to negotiate and let the militants say they had not capitulated to U.S.-led troops.

The development came just a day after al-Sadr’s militants rejected a government ultimatum to withdraw from the shrine or face an assault on the walled compound. Iraqi Prime Minister Ayad Allawi backed off the threat after the new offer from al-Sadr, and his national security adviser reiterated that the government wanted al-Sadr to join the political process.

Al-Sadr has said previously he would not give in to the government demand to disband his militia and take up politics. It remained unclear how the government would react if that demand went unmet.

Sporadic explosions and gunfire were heard in the streets of this holy city, but the clashes were far fewer and less intense than in previous days. Fighting between Thursday and Friday mornings killed 77 people and wounded 70 others, officials said.

Armed militants could be seen around the shrine before sundown, circulating in the Old City district, but any who entered the Imam Ali compound left their guns with comrades outside, then reclaimed them when they exited. Inside the compound, unarmed fighters mingled with civilians.

An Associated Press reporter saw no weapons in the shrine. It was not possible to check whether any weapons were hidden inside, though militia leaders denied any were. No police or Iraqi security forces were in the shrine.

After nightfall, al-Sadr’s aides were still negotiating details of the shrine’s handover to representatives of Iraq’s top Shiite cleric, Grand Ayatollah Ali al-Husseini al-Sistani, who is in a London hospital for treatment of a heart problem.

It was not clear if the militia wanted its men to be able to stay in the compound, which they have used as a refugee. But al-Sistani’s representatives insisted the fighters had to leave before they would take responsibility for the shrine.

Muslim worshippers loyal to radical Shiite cleric Muqtada al-Sadr pray in the Imam Ali Mosque as armed militants clash with U.S. and Iraqi forces in the besieged city of Najaf, Iraq. Militiamen removed their weapons Friday from the shrine, but did not hand over control of the site.

“If they want to vacate the holy shrine compound and close the doors, then the office of the religious authority in holy Najaf will take these keys,” an al-Sistani aide, Sheik Hamed Khafaf said, from London. “Until now, this hasn’t happened.”

The government was not part of the talks, and it continued to demand that al-Sadr disband his militia and join in peaceful politics and help create a democracy for Iraqis.

“We need to get rid of this militia and we need to get them to disarm and leave the shrine,” Iraqi National Security adviser Mouaffaq al-Rubaie told CNN. “There’s no way we can build democracy in this country with a militia all over the country.”

A previous uprising led by al-Sadr in the spring ended with a series of truces that kept his militia intact to fight in a new round of violence that started Aug. 5. The government and the U.S. military have said any resolution to the fighting should ensure there is no third round.

Other developments

Meanwhile, insurgents ambushed a U.S. military patrol with a bomb Friday in Samarra, 60 miles north of Baghdad, killing two American soldiers and wounding three, said Maj. Neal O’Brien, a spokesman for the U.S. Army’s 1st Infantry Division.

The military also reported that two Marines had been killed in action in the restive Anbar province, one on Wednesday and the other on Thursday. As of Thursday, 947 U.S. personnel had died since the beginning of military operations in Iraq in March 2003, according to the U.S. Defense Department.

West of Baghdad, U.S. warplanes staged two airstrikes Friday in Fallujah, which is a hotbed of Sunni Muslim insurgents. Two people were killed and six injured in the first attack just after midnight, said Dia’a al-Jumeili, a doctor at Fallujah’s main hospital. A second missile hit an industrial area in the morning, wounding three people.

In Baghdad, troops from the U.S. Army’s 1st Cavalry Division pulled out of the Sadr City slum, which saw fierce fighting between U.S. forces and al-Sadr’s supporters the day before.

Fighting throughout Baghdad killed 11 people and wounded 63 between Thursday night and Friday night, the Health Ministry reported.

Police in the southern city of Amarah said al-Sadr militants blew up an oil pipeline near town Friday. The extent of damage to the line, which runs from the southern Bezergan oil field to a refinery in Amarah, was not immediately clear, officials said. The attack came a day after Mahdi Army fighters set an oil company’s offices and warehouses on fire near Basra.