Norfolk helicopter crash: Four feared dead
Police said a civilian aircraft with four people on board had crashed in Gillingham, near Beccles, at about 19:30 GMT.
Emergency services remain on scene and a cordon around the site is in place.
It is not yet known what caused the crash but eyewitnesses reported foggy conditions in the area at the time the helicopter came down.
The East of England Ambulance Service NHS Trust said it was called at 19:45 to reports of a helicopter crash.