People living in the village of Gillingham have been speaking about the moment a helicopter crashed, killing four men onboard, including millionaire peer Lord Ballyedmond.
Today air accident investigators are examining the wreckage and crash site.
The helicopter in question was often used to ferry workers over to the hall, they were staying here as residents as well. They were doing all kinds of work up there, carpet fitting, decorating, general stuff.
It made us open the back door because the sound was so loud and slow, but it was gone 8 o'clock. Really loud, not like the usual helicopters you hear and you couldn't really see because it was so foggy.
41-year-old James Tuttle who lives in nearby Geldeston saw the helicopter come down.
We used to see him coming and going in his helicopter from our back garden all the time. At about 7pm we noticed the helicopter coming in very low and at an unusual 45-degree angle. We didn't hear any bang or explosion, it just seemed to be flying in a strange way. The fog wasn't bad at the time, just patchy, it only got worse about an hour after the crash happened.
As the fog lifts around Gillingham near Beccles, the crash site can be seen from the Norwich to Lowestoft Road, the A146.
Air accident investigators are at the scene of the crash, examining the area.
The helicopter came down in the field close to the well known McDonalds roundabout.
Wreckage of the Agusta Westland AW139 helicopter which came down at Gillingham close to the Norfolk and Suffolk border.
Norfolk police were only able to carry out a limited search last night because of thick fog in the area.
More detailed forensic investigations will be carried out today as Air investigators examine the scene.
As the fog lifts around Gillingham, ITV News Anglia cameraman Sean Cockrell has sent back one of the first pictures of the crash site.
Four people died when the helicopter came down at around 7.30pm last night.
Police have closed roads around the scene of last night's helicopter crash at Gillingham near Beccles.Read the full story ›
Air accident investigation teams has arrived at the scene of last night's helicopter crash at Gillingham near Beccles.
This morning's thick fog has slowed down the progress of the investigations so far.
The fog is not showing any signs of lifting as yet as they arrive at the scene of the crash.
Norfolk police held a press conference earlier. Chief Inspector Stuart Armes has said that only limited investigations took place overnight because of the thick fog.
There are road closures in the area and police are asking drivers to stay away.
Tributes have been coming in to the Northern Irish Conservative peer Lord Ballyedmond who died in the helicopter crash at Gillingham last night.
Stormont Enterprise Minister Arlene Foster, said. "Without doubt, Lord Ballyedmond was one of Northern Ireland's most successful entrepreneurs.
"He was known for his leadership, integrity and global vision. One of a kind and a self made businessman, he was both highly regarded and widely respected by all those who knew him."
The helicopter involved in last night's accident was an Agusta Westland AW139 but exactly what journey was involved is still to be determined.
What will emerge from the investigation by the Air Accidents Investigation Branch (AAIB) team will be the type of flying qualification held by the pilot.
Many helicopter pilots are permitted to fly only in good-visibility conditions during the day, with others being permitted to fly at night in good conditions.
Some pilots are qualified to fly using visual-aid instruments so that they are able to take to the skies when there is cloud, or poor visibility.
David Learmount, operations and safety editor of Flight Global said:
"Helicopter flying is usually done under clear-visual conditions. Helicopters are much more difficult to fly than aeroplanes and much more difficult to fly on instruments than planes.
"You have to be particularly careful if fog is around. It's a hell of a hazard."
The AAIB will also want to know if there was any communication from the helicopter before or during the flight.
If the helicopter had taken off from a private helipad in good conditions, then the pilot would not have needed any permission to get airborne.
Mr Learmount said the Norfolk accident had echoes of the helicopter crash in south London last year when experienced pilot Pete Barnes, 50, was killed when his aircraft clipped a high-rise crane in Vauxhall.
Tributes have been paid to Northern Irish Conservative peer Lord Ballyedmond, who was one of four men killed when a helicopter crashed in thick fog in Norfolk last night.
Lord Ballyedmond, one of the richest men in Northern Ireland, was chairman of Norbrook, the largest privately owned pharmaceutical company in the world.
Known as Edward Haughey until he was made a life peer in 2004, he owned Gillingham Hall, a stately home near the crash site, according to the Register of Lords' Interests.
The AgustaWestland AW139 helicopter came down in thick fog in a field in Gillingham, near Beccles, at 7.30pm yesterday.