Iraqi civilians flee from their homes with their belongings to look for a safer place during the second day of clashes between U.S. army and Iraqi National Guards with al-Mahdi army fighters loyal to radical Shiite cleric Muqtada al-Sadr in the holy Muslim city of Najaf, 100 miles (160 kilometers) south of Baghdad, Iraq, Friday Aug. 6, 2004. U.S. helicopters attacked militants hiding in a cemetery near the Imam Ali Shrine in the old city at Najaf's center, where smoke could be seen rising. Gunfire and explosions rang out as U.S. soldiers and Iraqi policemen advance toward the area. (AP Photo/Hadi Mizban)
BAGHDAD, Iraq - Fierce fighting between U.S. and Iraqi forces and Shiite rebels loyal to cleric Muqtada al-Sadr escalated in five cities Friday, in a second day of combat resembling the al-Sadr-led uprising of last spring.
U.S. and Iraqi forces, along with British and Italian troops, have killed about 300 Iraq militants in two days of fighting in Najaf, the U.S. military said Friday. The military also announced that two Marines were killed Thursday during combat with the rebels in Najaf. Thursday the military had reported one death.
Meanwhile, wire services reported that Grand Ayatollah Ali Sistani, Iraq's most influential Shiite Muslim cleric and a relative voice of moderation, arrived in London Friday for treatment of a heart condition.
"The ayatollah suffered a health crisis related to his heart a few days ago," his spokesman in Beirut Sheik Hamed Khafaf told the Associated Press.
Sistani's absence could leave a critical vacuum of leadership in the country's majority Shiite community.
And in Iraq's Sunni Muslim triangle west of Baghdad, the governor of Anbar Province, which includes the volatile cities of Fallujah and Ramadi, appeared on television in the company of men in masks and announced his resignation, a week after insurgents set fire to his house and kidnapped three of his sons.
Abdul Karim Rawi, shown on the al-Jazeera cable television network, read a statement saying he "repented" his cooperation with the "infidels." He looked grim, ashen-faced and under duress, although it was unclear whether he was in captivity.
A second day of clashes were reported Friday in Najaf, Basra, Nasiriyah, Amarah and in the Sadr City district of Baghdad itself, which is the Shiite cleric's stronghold.
The worst appeared to be in Najaf, where TV footage showed U.S. helicopters firing at targets within the city and plumes of dark smoke rising in the sky as masked militiamen from al-Sadr's Mahdi Army ran through the streets firing weapons.
Hospital officials in Najaf reported at least 10 dead Iraqis and another 40 wounded.
Shiite rebels have long warned that they would respond violently to any attack on Najaf - home to several important shrines important to Shiites worldwide.
After hearing about the situation in Najaf, people poured into the streets in Sadr City, where there was fighting between militiamen and Iraqi forces.
U.S. troops ringed Sadr City with tanks but did not enter the area, which appeared to still be under the control of Mahdi Army militiamen stationed at numerous checkpoints in the densely populated neighborhood.
"Najaf is now under siege," said Ahmed al-Shaibany, a spokesman for al-Sadr. "We call on the Islamic world and on the entire world to intervene and solve this problem. The revolution will continue as long as the occupation forces keep bombing the city."
One militiaman, Khadim Mohammed, 39, said his forces had received orders to be prepared to fight after hearing the news from Najaf. He said U.S. planes and helicopters had fired into Sadr City during the night, but that could not be confirmed independently.
Rebel cleric al-Sadr had called on his supporters Thursday to rise up anew against U.S.-led security forces, after a fragile two-month truce in Najaf ended with clashes that brought down a U.S. helicopter.
Al-Sadr's militia said Thursday it had gained control of Najaf, Amarah, Nasiriyah and Basra although Iraqi officials denied that the fighters had taken the cities.
Al-Sadr's call for an uprising was his first significant test of Iraq's new interim government, which took office June 28, and signaled the end to the uneasy peace that had settled over Iraq's long-oppressed Shiite Muslim majority in the southern part of the country.
It wasn't clear whether the call would result in a broad revolt. In April, al-Sadr rallied his supporters to strike against the U.S. occupation, leading to two months of clashes that left hundreds dead. Many here said they would listen closely to the messages Shiite clerics deliver during Friday prayer services for an indication of what might happen this time.
Some of those services were fiery Friday. In his sermon, Sheikh Nasser Sadi denounced the Iraqi interior minister, accusing him of escalating the situation in Najaf.
"We call on all Iraqi people to protest the violations of our holy shrines," he said. "We appeal to Shiites and to the Islamic world to rise up and defend their shrines."
Interior Minister Falah Naqib pledged Thursday in Baghdad to find and arrest al-Sadr.
"We will not negotiate," he said at a news conference. "We will fight these militias. We have power to stop these people, and we'll kick them out of the country."
The U.S. military and Iraqi police said the fighting in Najaf Thursday began when Mahdi Army fighters attacked a police station overnight. The military said Iraqi forces called for help to resist the attack.
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Barbash reported from Washington.