LONDON — A U.S. Air Force Pave Hawk helicopter crashed in the coastal marshes of eastern England during a training mission on Tuesday night, killing all four crew members aboard, officials said.

The helicopter crashed at about 6 p.m. local time near Salthouse on the Norfolk coast, a statement from the U.S. Air Force said. The aircraft was based at the nearby Royal Air Force station in Lakenheath, Suffolk County, which hosts USAF units and personnel.