In September 2013 a security review was launched after an intruder was able to scale a fence and get inside the palace, before being arrested by police.
She said: "The 22-year-old man was arrested at approximately 02:00hrs on Wednesday, 10 July by officers from the Met's Royalty and Specialist Protection Command after he climbed over the front gates at Buckingham Palace".
Exactly 37 years ago, intruder Michael Fagan famously managed to break into the Queen's bedroom at Buckingham Palace.
As of now, a police spokesperson said the man, who didn't have any weapons on him, is in the custody of the central London police and is being held on suspicion of trespassing.
The Queen was in residence at the time, a palace spokeswoman confirmed.
Buckingham Palace insiders last night revealed the Queen is to be informed of the incident.
The Queen was asleep just metres away during what has been called a "major security breach".
London police have arrested a man who climbed the front gates of Buckingham Palace while Queen Elizabeth II was in residence. He said he had been there a month before, at which time he had a good look around the palace before stealing a snack of cheese and crackers.
A Palace source explained: "Of course this will be a matter of great interest to the Queen".
Prince Andrew said: "The police have a hard job to do balancing security for the Royal Family and deterring intruders, and sometimes they get it wrong". What about heat censors and CCTV?
In 2013, a man was arrested for burglary, trespass and criminal damage when he was caught in one the Palace's state rooms after scaling a 12ft fence, The Telegraph reports.
The Queen had just returned home from a trip to Cambridge when the incident took place.
Another source added: "Everyone knows the Queen was there because the Royal Standard was flying".
As the 31-year-old schizophrenic began to tell his monarch about his family problems, she pushed the panic button by her bed but got no response.
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