FALLUJAH, Iraq (AP) _ Three U.S. Marines were killed in action in Iraq's volatile western Anbar province on Thursday, a military spokesperson said.

The spokesperson would not say where the three were killed, but the deaths were reported as U.S. troops fought insurgents in the city of Fallujah, which is in Anbar. F-18 fighter jets dropped several bombs in the city, sending up plumes of smoke, while tank and machine gun fire could be heard to the south.

The Marines do not give details of such deaths for security reasons, fearing the information could help Iraq's insurgents.

The deaths brought to 1,325 the number of American troops killed in Iraq since the invasion in March 2003.