A spokesman for the US military said the man, who has not yet been named, was caught along with five other men in a night raid on a building in the Iraqi city of Falluja.
US air raids
The bombings were part of another day of violence in Iraq.
There are reports of an attack in the Green Zone in Baghdad, where US forces and the Iraqi government are based, although no casualties were reported.
And US planes bombed Falluja overnight on Friday.
The US says it wants to make Falluja a safe place and has recently moved some of its soldiers there to try and take control of the city.