Six US troops have been killed in Iraq in the past three days, mostly victims of roadside bombs in Baghdad, the US military has said.
The announcement came as a suicide car bomb hit a market in northern Iraq killing at least 22 people and wounding 40 others.
The US military said four soldiers were killed by roadside bombs in Baghdad, three on Friday and one on Saturday. Two Marines were killed in combat in Anbar province.
There are now 157,000 US military personnel in the country.
So far this month 20 soldiers have been killed, half of them in Baghdad, with a total of nearly 3,600 US soldiers killed in the conflict.
Suicide blast
At least 22 people were killed on Saturday when an attacker detonated a suicide truck bomb in a northern Iraqi village market, bringing down nearby houses, a police commander said.
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Lieutenant Colonel Hussein Ali Rasheed, deputy chief of police in the northern town of Tuz Khurmatu, said the blast had devastated the heart of Emerli, a small community from Iraq's Shia Turkoman minority.
"There are around 40 wounded. Some of the houses collapsed on people, and more may be trapped inside," Captain Nuzad Abdallah, another officer, said.
Mortar attack
Overnight, a mortar killed seven members of a family in Baghdad as they slept on their roof, police said.
Constant power outages force Iraqis to often sleep on the roof of their homes to try and escape sweltering summer temperatures inside.
Police said the mortar bomb that killed seven family members in the mostly Sunni neighbourhood of Fadhil in central Baghdad also wounded two neighbours.
A resident who lives near the area said clashes broke out after the attack.