Five US soldiers have been killed in central Iraq, the US military has said.
It gave no further details but Iraqi sources said there had been a rocket attack on Camp Victory on the outskirts of Baghdad.
Washington officially ended combat operations in Iraq last August, leaving fewer than 50,000 US troops in Iraq.
US fatalities have been rare, although two US soldiers died when an Iraqi soldier opened fire on them in a training exercise in January.
The US soldiers' role is to advise and assist Iraq's security forces in fighting insurgents.
The military statement simply read: "Five US service members were killed Monday in central Iraq."
The names of the deceased are being withheld until next of kin have been informed.
An independent count of US service member fatalities in Iraq now stands at 4,459.
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