A suicide bomber reported to be a woman has attacked a police recruiting centre in Iraq, leaving at least 14 dead.
Roadside bombings pose a real threat to US soldiers
About 20 people were reported to have been wounded in the attack on a large crowd of would-be officers at a centre in Muqdadiya, north-east of Baghdad.
In Baghdad, five civilians were killed by a car bomb near the university.
The US military also announced three soldiers died in a roadside bomb attack in Baghdad on Monday, and another in combat in western Anbar province.
These latest deaths bring the estimates of the number of US military fatalities to about 40 this month.
Tallies vary, but about 3,280 US soldiers have been killed in Iraq since the 2003 invasion.
In Muqdadiya, the figure dressed in the traditional black abaya detonated a bomb within a crowd of people who were seeking recruitment forms to join the police force, local officials said.
Both recruits and passers-by were reported to be among the casualties.
Female suicide bombings are unusual but not unprecedented in Iraq. A major attack in February at a university in Baghdad was carried out by a female bomber.
Meanwhile, the US military has denied earlier reports that a US helicopter had crashed in the centre of the capital.
Iraqi police reported clashes around the scene of the apparent incident, saying the US had sealed the area off.
However, a US military spokesman in Baghdad, Lt Col Christopher Garver, told the BBC that a US helicopter was fired upon but returned safely to its base.
The US has lost more than 50 military helicopters in Iraq since the invasion with the loss of a number of soldiers.