Andrew Mountbatten-Windsor has been left shaken after being confronted by a man wearing a balaclava close to his new Sandringham home.
The suspect has been arrested by Norfolk Police for allegedly carrying an offensive weapon and threatening behaviour in the village of Wolferton last night.
The man, who remains in police custody in Kings Lynn, was said to be waiting in a car and started running at the former Duke of York, who was walking his dogs at around 7.30pm on Wednesday.
The balaclava-clad was apparently agitated and 'shouting at him' from 50 yards away.
Andrew, who was with a bodyguard, ran back towards his own car and drove off at speed.
The suspect still tried to chase on foot. Police were called and arrived shortly afterwards, arresting the man and searching his car. They may have found a weapon.
The incident last night was apparently on public land close to Marsh Farm, where Andrew has been moved to by King Charles after he left Royal Lodge Windsor.
A Norfolk Police spokesman said: 'Officers were called to Wolferton shortly after 7.30pm yesterday following a report a man was behaving in an intimidating manner in the village.
'Officers attended, and the man was arrested on suspicion of a public order offence and possession of an offensive weapon.
'He was taken to King’s Lynn Police Investigation Centre for questioning and remains in custody'.
Andrew Mountbatten-Windsor, pictured after his arrest in February, was apparently confronted by a mystery man in a balaclava yesterday
Andrew was said to be 'shaken' by what happened and he has been asked for a statement, as has his personal protection officer.
Buckingham Palace has been asked to comment.
The balaclava incident came weeks after a man and girl sparked security concerns outside Andrew's new home.
The former prince was inspecting Marsh Farm, his new permanent home on the King’s Sandringham estate, when a red car pulled up outside on Thursday, April 2.
Two people got out and proceeded to scale the exterior gate before attempting to peer over a newly erected 6ft fence in front of the farmhouse.
Pictures show a man and a girl stood on top of the gate while trying to catch a glimpse inside the property, which is undergoing renovation works ahead of Andrew's move in the coming weeks.
Andrew's security was quick to react and the pair jumped back in their car and drove off.
Andrew appeared spent the afternoon at his new house and was seen meeting up with the Sandringham estate manager, Edward Parsons.
He is currently living at nearby Wood Farm, whilst his new house is being renovated, but has made several trips there this week to check on the progress.
Builders have been working flat out to get the property ready for Andrew, fitting luxury carpets, a Sky dish and a fast broadband connection.
A man and a girl are seen attempting to scale the fence of Andrew Mountbatten Windsor's new home last month
Andrew was seen visiting the property just a day earlier as he was spotted behind the wheel of his Range Rover wearing a maroon cable-knit jumper, with his security guard next to him in the passenger seat.
The disgraced ex-Duke has been accused of leaking secrets to Jeffrey Epstein while working as a UK trade envoy.
He has been keeping a low profile in Norfolk since his arrest on suspicion of misconduct in a public office on his 66th birthday on February 19.
Before moving to Sandringham a few weeks ago, Andrew was regularly seen horse riding around Windsor. But he has gone to ground.