Two U.S. soldiers were killed Thursday in a suicide car explosion, the U.S. military said.
The attack took place at about 2:35 p.m. local time (1135 GMT),the military said in a brief statement, adding that nine civilians were injured.
A spate of blasts mostly targeting Iraqi police hit Iraq over the past week after the Iraqi parliament passed a security agreement with Washington on Nov. 27.
On Thursday, Iraq's presidency council ratified the pact which allows the American troops to stay here until the end of 2011 after the UN mandate expires in less than one month.
The controversial document is vehemently opposed by the Shiite cleric Muqtada al-Sadr.
The two governments also have to get it survive a referendum next July.
Lieutenant General Lloyd Austin, the No. 2 U.S. commander in Iraq, said Wednesday that violence in November dropped to the lowest level since 2003.
Yet, the recent attacks came as a grim reminder of the fragile security on the ground. Dozens of people have been killed in those explosions and hundreds wounded.
On Thursday, two suicide car bombings against police stations killed at least 15 people and injured 147 in Fallujah in Anbar province.
Over 4,200 U.S. soldiers have been killed in Iraq since the U.S.-led invasion in March 2003, according to media count based on Pentagon figures.