An intruder broke into Buckingham Palace as the Queen slept earlier this week.
A 22-year-old man reportedly scaled the fence and managed to get inside the palace where he attempted to knock down the doors of the residence.
The BBC reports that police said the intruder was not carrying a weapon and the incident is not being treated as terror-related.
The Metropolitan Police Service said the man was held on suspicion of trespass on Wednesday by specialist royal officers.
The Queen was in residence at the time, a palace spokeswoman confirmed.
According to the BBC, the man remains in custody at a nearby police station in central London.
Meanwhile, a royal source told The Sun: "There was an intruder at the Palace while the Queen lay sleeping in her bedroom and he was on the loose for a good few minutes before the cops arrested him.
"He was determined to get inside the palace and was banging down the doors but, thank goodness, this time everything was locked up."
The source added: "The police eventually detained him under the mental health act, but they have to ask some serious questions about how he got on and how he had so long to roam free."
He was determined to get inside the palace and was banging down the doors.
Ent Daily has contacted a rep for Buckingham Palace for comment.
Back in July 1982, unemployed labourer Michael Fagan scaled the walls and broke into Her Majesty's bedroom - which was one of the 20th century's worst royal security breaches.
It was said that Fagan wandered the palace corridors for several minutes before reaching the royal apartments and entering the Queen's bedroom.
It was reported that the Queen woke when he disturbed a curtain and Fagan sat on the edge of her bed.
In a 2012 interview, Fagan claimed the Queen left the room immediately to seek security and she phoned the palace switchboard twice for police, but none arrived.
Shortly after, the duty footman Paul Whybrew appeared followed by two policeman who removed Fagan from the palace.
Fagan was not charged for trespassing in the Queen's room as it was then a civil wrong rather than a criminal offence.
He was charged with theft as he took wine, but the charges were later dropped when he was given a psychiatric evaluation.
Fagan spent six months in a psychiatric hospital before being released in January 1983.
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