7 January 2014 Last updated at 23:05 GMT
Four people are believed to have been killed when a helicopter crashed, police have said.
The aircraft came down in the Cley area in north Norfolk, off the east coast of England. Emergency services are at the scene with a 1,200ft (400m) area cordoned off.
The helicopter is an HH-60G Pave Hawk, based at RAF Lakenheath in Suffolk, a spokesman for the USAF confirmed.