Baghdad, Iraq ? Gunmen wearing uniforms of a Shiite-led security force swept into a Sunni Arab neighborhood in central Baghdad before dawn Monday, killing three men and speeding away with more than 20 others, police and witnesses said.

Meanwhile, the U.S. military said seven more U.S. troops had been killed – a soldier in a roadside bombing in Baghdad on Monday, two Air Force members in a blast near Taji north of the capital late Sunday, and four soldiers in a roadside bombing near the northern town of Hawijah on Friday.

The latest deaths of Americans brought the number of U.S. military personnel killed since the war in Iraq began in March 2003 to at least 2,231, according to an Associated Press count.

Also Monday, bodies of eight Sunni Arabs were found in a field north of Baghdad – five days after they were seized on their way home by bus after being rejected for admission to the police academy in the capital. Twenty-three bodies of the group were found Sunday, and 35 were believed to have been on the bus. Police often are targeted by insurgents.

Tensions inflamed

The pre-dawn raid in the predominantly Sunni Arab of Toubji threatens to inflame sectarian tensions as leaders of Iraq’s religious and ethnic communities prepare for talks on a unity government to include Sunni Arabs, the heart of the insurgency.

Sunni Arabs have long complained of abuse by Shiite militias and security services and have demanded that those responsible be punished.

The raid began about 5 a.m., when seven carloads of gunmen rolled into the neighborhood, witnesses and police said. The gunmen fanned out, entering one mosque and several homes. They dragged males out of their beds and herded them into the street.

Yaser Khalil, 24, shows his handcuffs after being released following a kidnapping and killing spree in a Sunni Arab neighborhood of Baghdad, Iraq. Khalil's uncle, Ismail Mohsen, was one of three men killed in an early morning raid on Monday.

Hooded figures, presumably informants, identified those to be taken away, witnesses reported. Three men were shot dead and about 20 were forced into trucks and driven away, witnesses said.

Three men were later freed in eastern Baghdad but the rest remained unaccounted for, witnesses added. One of those released, Yasser Khalil, 24, said he was beaten.

“They took us away and put us into a room in a building I didn’t recognize, where they beat us and asked us questions about who we were,” he said. “Then they took a few of us in their cars and dumped us on the eastern outskirts of Baghdad, saying if we said anything or looked at them they would kill us.”

He said his uncle, Ismail Mohsen, 44, was one of the three men killed.

Police Maj. Falah al-Mohammedawi said it was unclear whether the gunmen were government security forces or simply wearing uniforms, which are easily obtained in Iraq.

Later Monday, a senior official of a government organization that administers Sunni mosques was slain by gunmen as he drove home from evening prayers at a Baghdad mosque. Naji Mohammed al-Eithaw, 55, had served as a spokesman for the Sunni Endowments and was a regular contributor to Baghdad newspapers.

Sunni Arabs have long complained of abuses by the Shiite-led forces, accusing them of abducting and killing Sunni civilians under the pretext of battling the insurgency. Shiite civilians also are targeted by Sunni extremists.

“This issue is grave and will only ignite more violence in the country,” Sunni politician Harith al-Obeidi said of the Toubji raid. “The government should take serious steps to stop such acts.”

Journalist still held

There was no word on the fate of kidnapped American journalist Jill Carroll. Iraqi officials said joint U.S.-Iraqi operations were carried out recently to free her, but they provided no details.

Carroll, a freelance journalist for The Christian Science Monitor, was abducted Jan. 7 in Baghdad and her translator was killed. She has not been heard of since her kidnappers released a videotape first aired on Jan. 17. It included a threat to kill her unless all female detainees are freed.

Iraqi Deputy Justice Minister Busho Ibrahim Ali said six of the nine Iraqi women in U.S. custody were expected to be freed this week as part of a routine release planned before the kidnappers’ ultimatum. There has been no U.S. confirmation, but Ali said he believed the Americans were wary about the releases being seen as part of a swap for Carroll.

More than 250 foreigners have been taken hostage in Iraq, either by insurgents or gangs, since the 2003 U.S.-led invasion that toppled Saddam. At least 39 have been killed.