Published Tuesday, 07 January 2014
Norfolk Police believe four people have died in the crash. (© UTV)
It happened at Cley-next-the-Sea on Tuesday evening.
The US Air Force has confirmed that the HH-60G Pave Hawk helicopter was on a regular training exercise when it was involved in the incident.
Emergency crews are currently attending the scene where a large area has been cordoned off.
A statement from Norfolk Police said: "Police are currently dealing with a single helicopter crash in the Cley area, on the North Norfolk coast. There are believed to be four fatalities.
"Officers are on the scene, with a 400 metre area cordoned off."
A spokesman for the Royal National Lifeboat Institution said: "We were asked for three lifeboats to respond to reports that an aircraft had possibly ditched in the sea.
"Lifeboats Wells, Sheringham and Cromer were launched at the request of the coastguard but were stood down when it was confirmed that the aircraft had come down over land."
The US Air Force has a base in RAF Lakenheath, Suffolk.
© UTV News