From a loudspeaker on a mosque still controlled by insurgents, the fighters replied: "We ask the American soldiers to surrender and we guarantee that we will kill and torture them."
Dawood said the offensive failed to produce Abu Musab Zarqawi, the Jordanian leader of al Qaeda in Iraq, a guerrilla group that had made a base in Fallujah in an uneasy alliance with local insurgents. Indeed, by Friday morning, insurgent leaders claimed that 90 percent of the group's fighters had left the city and that the remaining 10 percent had been killed. Dozens of survivors were said to be traveling to Baghdad to carry out attacks.
U.S. Marines call for support after coming under fire in Fallujah. Some insurgents were armed with assault rifles and rocket-propelled grenades.
(Anja Niedringhaus -- AP)
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An insurgent spokesman, speaking on al-Jazeera television, called on "scores or hundreds of brothers of the mujaheddin . . . to press the American forces" outside Fallujah. And a group of insurgents released a videotape to "announce the spread of the battle to all . . . parts of Iraq," according to Reuters news agency, which received the tape in Fallujah.
Large portions of Mosul remained under the control of insurgents. On the western side of the city of 1.8 million, residents reported no sign of government authority or a U.S. military presence. Police stations, overrun and looted by insurgents on Thursday and Friday, remained deserted. Streets were empty of all but rubbish and armed men who roamed the city. A car bomb detonated beside a convoy of Iraqi National Guard troops, injuring seven.
Dawood said, however, that Mosul was "not out of the control of the government."
"Just because a bunch of gangsters attacked police stations and declared that they were in control for not more than two hours does not mean that the government has lost control," he said.
Allawi said reinforcements of Iraqi security forces had begun arriving overnight to replace the Mosul police -- a force of perhaps 5,000 -- who largely deserted when the insurgents attacked.
Insurgents also harassed U.S. and Iraqi security forces in other cities in Iraq's Sunni Muslim heartland, including Baiji, Hawija, Tall Afar and Samarra.
In Baghdad, the Shiite Muslim mayor of the southern neighborhood of Bayaa, home to both Shiites and Sunnis, was assassinated, as was his Shiite predecessor earlier this year. Insurgents fired rocket-propelled grenades at the Education Ministry, the Associated Press reported.
Explosions echoed across the capital for a fourth day. Residents of the predominantly Sunni Adhamiyah neighborhood said insurgents fought U.S. troops for two hours overnight. Gunmen also roamed districts in the west and south overnight. On Saturday morning, a U.S. tank secured the southern edge of the Jadriya Bridge, which leads north toward the city center.
The battle for Fallujah, which insurgents have held since April, began with U.S. troops encountering only light to moderate resistance. Heavy artillery fire and air power seemed to knock the punch out of the resistance, which steadily pulled back from the main U.S. advance in the northern part of the city. But commanders warned that insurgents were likely to make a serious stand somewhere in the city.
Some U.S. commanders expressed surprise at finding fighters wearing uniforms and fighting like professionals. Unlike the insurgents who battled forces in the northern district, the forces in the south popped up, shot off a round and then moved.
But in urban combat, an organized force is also easier to identify, said Staff Sgt. Christopher Echevarria, 25, an Army Task Force 2-2 soldier from Crescent City, Calif.
"It's good they have uniforms," he said. "It makes it easier to know who to kill."
Vick reported from Baghdad. Special correspondent Omar Fekeiki contributed to this report.
