The U.S. military acknowledged the raid and said it captured one insurgent. It took place near Balad, about 50 miles north of the capital. But the military said only four people were killed — a man, two women and a child.

Authorities in the Shiite holy city of Karabala, meanwhile, imposed a six-day driving ban starting Thursday to protect pilgrims from a wave of sectarian killing. Defense Secretary Donald H. Rumsfeld hinted that U.S. troop levels may increase slightly in the coming days because of the pilgrimages connected to the holiday of Ashura, which ends March 20. Increased attacks marked the celebration during 2004 and 2005.

Rumsfeld said Gen. George Casey, the top U.S. military officer in Iraq, "may decide he wants to bulk up slightly for the pilgrimage." He did not elaborate. Police Capt. Laith Mohammed, in nearby Samarra, said American warplanes and armor were used in the strike, which flattened the house and killed the 11 people inside.

An AP reporter at the scene in the rural Isahaqi area said the roof of the house collapsed, three cars were destroyed and two cows killed. Eleven bodies, wrapped in blankets, were driven in the back of three pickup trucks to the Tikrit General Hospital, about 45 miles to the north, relatives said.

Associated Press photographs showed the bodies of two men, five children and four other covered figures arriving at the hospital accompanied by grief-stricken relatives. The victims were covered in dust with bits of rubble in their hair. Riyadh Majid, who identified himself as the nephew of the killed head of the family — Faez Khalaf — told AP at the hospital that U.S. forces landed in helicopters and raided the home early Wednesday.

Khalaf's brother, Ahmed, said nine of the victims were family members who lived at the house and two were visitors. "The killed family was not part of the resistance, they were women and children," Ahmed Khalaf said. "The Americans have promised us a better life, but we get only death."

The U.S. military said it was targeting and captured an individual suspected of supporting foreign fighters for the al-Qaida in Iraq terror network. "Troops were engaged by enemy fire as they approached the building," said Tech. Sgt. Stacy Simon, a military spokeswoman. "Coalition forces returned fire utilizing both air and ground assets."

Bomb blasts killed at least four more people and injured dozens Wednesday in Baghdad and north of the capital. The worst attacks were in Baqouba, 35 miles northeast of Baghdad, where there were at least three explosions.

A suicide bomber on a bicycle missed a police patrol, killing two civilians and injuring six others, police said. The provincial command said the bomber's explosives appeared to have detonated prematurely as he was pedaling toward the patrol.

Later, an explosion in a cell phone shop killed two more people and injured 12, police said.

Police at the scene found apparatus used to detonate explosives, leading them to suspect the shop may have been used to manufacture bombs. At least five other shops were damaged in the blast.

Another bomb targeting a police patrol injured two officers, police said.

The Iraqi army hit back Wednesday, arresting about 20 suspects and confiscating numerous weapons in a dawn raid in a nearby farming area, said Lt. Col. Tarik Muhei.

Late Tuesday, a roadside bomb exploded as an official with the Shiite Badr group was driving through Tuz Khormato, 130 miles north of Baghdad. The official, Ali Karim, escaped unharmed but his son was killed and nine other people were injured, police Brig. Sarhad Qadir said. The Badr group is linked to a Shiite militia accused of widespread abuses by Sunni Muslims.

The deaths of 87 men were blamed on deepening sectarian violence in recent days — most of them shot to death execution-style. Twenty-nine of the bodies, dressed only in underwear, were dug out of a single grave Tuesday in a Shiite neighborhood of east Baghdad.

The timing of the killings linked much of the bloodshed to revenge killings for a bomb and mortar attack in a Baghdad Shiite slum that killed at least 58 and wounded more than 200 at nightfall Sunday.

Revenge was swift in some cases, and by early Monday police began uncovering the bodies, although the discoveries were not immediately reported. The gruesome finds continued through the day Tuesday, marking the second wave of sectarian retribution killings since bombers destroyed an important Shiite shrine last month.

In the mayhem after the golden dome atop the Askariya shrine in Samarra was destroyed on Feb. 23, more than 500 people were reported killed, many of them Sunni Muslims and their clerics. Dozens of mosques were damaged or destroyed.

Underlining the uneasiness in Baghdad, Interior Ministry officials announced another driving ban, this one from 8 p.m. Wednesday to 4 p.m. Thursday to guard against car and suicide bombs while the Iraqi parliament meets in its first session since the Dec. 15 election.

After the driving ban was announced, the Cabinet said Thursday would be a holiday in the capital, presumably because residents would not be able to get to work. Restrictions on movement also had been put in place on the two weekends after the Samarra bombing to try to quell the violence.

Scores of frightened Shiite families have fled predominantly Sunni parts of Baghdad in recent weeks, some at gunpoint. More than 100 families arrived between Monday and Tuesday alone in Wasit province, in the southern Shiite heartland, said Haitham Ajaimi Manie, an official with the provisional migration directorate.

North of the capital, a roadside bomb exploded Tuesday among Shiite pilgrims headed on foot to Karbala, killing one person and injuring seven near Baqouba, police said.

Also Tuesday, the U.S. military reported the deaths of two more soldiers in fighting in the insurgent-infested Anbar province. That raised the death toll of U.S. military members killed since the start of the war in March 2003 to 2,310, according to an Associated Press count. The figure includes seven military civilians.

Source: AP