The man was reportedly drunk but unarmed and the breach which occurred in the early hours of today is not believed to be terrorism related, according to Metropolitan Police officers on guard at the British monarch's residence.
"At approximately 04:15hrs on Tuesday, August 9, officers arrested a 22-year-old from Croydon on suspicion of trespassing on a protected site (contrary to section 128 of the Serious Organised Crime and Police Act 2005) after he climbed over a security fence at Buckingham Palace," a Met Police statement said.
The incident follows another in May this year when Denis Hennessy, a 41-year-old man cut his right hand climbing over the perimeter wall of the palace.
He had pleaded guilty to trespassing and was jailed for four months. There have been a number ofsecuritybreaches at BuckinghamPalacein the past, with the most famous one being that of Michael Fagan, who got into the Queen's bedroom in 1982 and spent 10 minutes talking to her before she managed to raise the alarm when he asked for a cigarette.