The man was arrested on suspicion of trespass on a protected site and possession of Class A drugs.

A security scare took place at the castle on Sunday (Image: Mark Kerrison/In Pictures via Getty Images)

A security scare occurred at Windsor Castle on Sunday after a man climbed the fence to break into its grounds. The man, in his 30s, was arrested on suspicion of trespass on a protected site and possession of Class A drugs.

It is believed the suspect clambered over a wall to get into the private grounds of the castle. He was then quickly detained by the Met Police Royal and Specialist Protection Command before being taken into custody.

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A source told The Sun: “The intruder is believed to have been under the influence of drugs at the time of the break-in. He broke into the castle near Town Gate and was quickly detained by police.”

An investigation into the incident is underway.

The man, who has not been named by police, did not come into contact with any members of the Royal Family and was spotted by police soon after entering the grounds, which has 24 hour security.

He is not believed to have got close to Windsor Castle, where King Charles and Queen Camilla sometimes reside, or Adelaide Cottage – a property on the grounds that Prince William and Princess Kate live in with their children Prince George, Princess Charlotte and Prince Louis.

Prince William and Princess Kate live with their children in a nearby cottage (Image: Samir Hussein/WireImage)

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The Sun reports that the Prince and Princess of Wales were believed to be at home with their children that day. However, it has not been confirmed whether they were there at the time of the break-in.

The family are believed to have moved to Windsor with their children in 2022 to be closer to the late Queen, who lived in Windsor Castle at the time, and to give their children access to more outdoor space and privacy.

Prince William and Princess Kate have not commented on Sunday’s incident.

A Met Police spokesperson said: “A man in his 30s has been arrested on suspicion of trespass on a protected site and possession of Class A drugs after entering restricted grounds at Windsor Castle. Officers in the grounds spotted the man just after 13:00hrs on Sunday, 1 June and quickly arrested him.”

Thames Valley Police also released a statement that read:“At just after 1pm on Sunday 1 June a man entered restricted grounds at Windsor castle. He was quickly challenged by Met police officers and arrested. He did not enter the inner grounds of Windsor Castle.

“He was arrested on suspicion of trespass on a secure site and possession of class A drugs. He has been bailed and an investigation is ongoing by Thames Valley Police.”