US media houses say sectarian violence has engulfed Iraq.
The raid resulted in no US casualties.
“It was reported that one of the insurgents was wounded and other insurgents came to remove him from the scene,” the US military statement said.
A US raid in the Iraqi city of Ramadi claims civilian lives
Lieutenant-Colonel Bryan Salas, a US marine spokesman, said: “Efforts are under way to co-ordinate and offer available assistance to surviving family members.
“The concern is loss of innocent life.”
Ramadi is in Anbar province, scene of some of the fiercest fighting between US forces and fighters.