The U.S. military says an American soldier has been killed in combat in Iraq.

A statement says the Multi-National Division — Baghdad soldier died Sunday but further details weren't released.

The statement was issued Monday, on the eve of a deadline for U.S. combat troops to withdraw from Iraqi cities.

American soldiers will still be in urban areas but their mission will shift from one of combat to training and advising their Iraqi counterparts.

The statement says the soldier's death is under investigation.

At least 4,319 members of the U.S. military have died in the Iraq war since it began in March 2003. That's according to an Associated Press count.