London police say an intruder tried to climb a security fence at Buckingham Palace, but did not gain access to landmark building.
The Metropolitan Police say officers monitoring CCTV cameras saw the 22-year-old from Croydon and arrested him early Tuesday inside a security perimeter on suspicion of trespassing on a protected site.
Police say he had been drinking, was not armed and was detained without using stun guns. The breach is not believed to be terrorism related.
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Several intruders have breached security at the queen's London residence over the years — including a man convicted of murder who climbed a wall in May while Queen Elizabeth II was at home.
Buckingham Palace declined to comment on the intruder, but the royal family was not there at the time.