Also Saturday, suicide attackers killed at least nine Iraqi forces in separate attacks in Baghdad and just south of Mosul as insurgents kept up their campaign against the nation's U.S.-trained security force.
Iraqi police also arrested a would-be suicide bomber in the capital before he could detonate an explosive belt among a crowd mourning the victims of an attack earlier this week that killed 27 people, mostly children, an official said. It was the second thwarted attack this week.
The U.S. military said in a statement that the charges against the 11 troops, who served in the Baghdad area but were not otherwise identified, were filed Wednesday after another soldier complained about the alleged assaults.
"None of the insurgents required medical treatment for injuries related to the alleged assault," the statement added. "Only one of the suspected terrorists remains in custody of coalition forces at this time."
The soldiers had been assigned to the Army's Task Force Baghdad but were taken off-duty pending the investigation, the military said, adding that the Army's Criminal Investigation Division would determine whether they should face trial by court-martial.
"Allegations of illegal activities will always be thoroughly investigated," said Lt. Col. Clifford Kent, a Task Force Baghdad spokesman.
U.S. commanders have been especially sensitive about alleged mistreatment of detainees since the abuse of inmates at Abu Ghraib prison resulted in a major scandal involving America's handling of prisoners both here and in Guantanamo Bay, Cuba.
The attack against the British occurred as the troops were on patrol about 2:30 a.m. in the city of Amarah in Maysan province, 180 miles southeast of Baghdad. Three British troops were killed and two wounded, according to Britain's Ministry of Defense.
British Prime Minister Tony Blair, a staunch U.S. ally, expressed his condolences for the dead soldiers.
"The bravery of our armed forces was yet again underlined as they help Iraq and its people towards the democracy they so desperately want," Blair said Saturday.
The fatalities brought to 92 the number of British servicemen who have died since the Iraq war started in March 2003. Britain has about 8,500-troops in the country, mostly based in the largely Shiite south, where support for the Shiite-led government in Baghdad is stronger.
British losses have been far fewer than those suffered by the larger U.S. force, which is bearing the brunt of the fight against Sunni Arab insurgents in northern, western and central Iraq. At least 1,763 members of the U.S. military have died since the war started.
In other violence Saturday, a suicide attacker detonated an explosive belt inside a police station 10 miles south of the northern city of Mosul, killing six policemen and wounding 20 others, Brig. Gen. Saeed Ahmed said.
A suicide car bomber also struck an Iraqi police patrol in the Baghdad subdivision of Dora, killing three commandos and wounding five civilians, hospital and police officials said.
Elsewhere in the capital, a suicide car bomber struck near a U.S. military convoy in the southeast of the city, setting a Humvee ablaze, police Lt. Col. Hassan Salloub said. No U.S. casualties were reported.
The attacks came a day after a wave of suicide car bombs and explosions targeting U.S. and Iraqi security forces rocked the capital, killing at least 33 people and wounding at least 111, including seven American soldiers.
One of the bombings hit after sundown on a bridge over the Tigris River near the home of President Jalal Talabani. Four security guards were killed and nine people were wounded in that attack. Talabani was at home at the time, aides said, but the target may have been a U.S. convoy.
Al Qaeda's wing in Iraq claimed responsibility in Internet statements for several of the attacks, but the authenticity could not be confirmed.
The would-be bomber arrested Saturday in Baghdad said he was Libyan, according to police Lt. Mohammed Jassim.
Jassim said police grew suspicious of the man, stopped him and discovered the explosives belt.
On Thursday, Iraqi and U.S. forces captured another suicide bomber before he could detonate his explosives belt as part of coordinated assaults just 150 feet from the Green Zone, the site of the U.S. Embassy and major Iraqi government offices.
A car bomb exploded successfully. But one pedestrian bomber was killed after an Iraqi policeman shot him, setting off his explosive vest. Five policemen and four civilians were wounded by the blasts and gunfire.
By Sameer N. Yacoub