David Belmar, 44, appeared in Southwark Crown Court in London
having pleaded guilty to trespassing on a protected site last
October and in possession of a bladed article. Police said he
was arrested trying to enter one of the palace gates.
The Queen was not at the palace at the time.
Belmar, of Haringey, north London, was sentenced to 16 months
imprisonment for possession of a knife and 6 months to run
concurrently for trespass.
The incident came only a month after police arrested two men
over a break-in at the palace in one of the most serious
security breaches there in around 30 years.
A police spokesman said both were bailed with no charges yet
laid. One of the men, aged 37, is now under the care of mental
health care professionals.
One of the biggest security breaches at Buckingham Palace
happened in 1982 when an intruder, Michael Fagan, climbed a wall
and wandered into a room where the queen was in bed.
(Reporting by Belinda Goldsmith;
editing by Alister Doyle)
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