British police officers used a taser stun gun on a man armed with two knives as he was heading towards the gates of Buckingham Palace yesterday.
When challenged outside the gates he held a knife to his own throat in front of crowds gathered outside Buckingham Palace for the Changing of the Guard ceremony.
A police office used a taser stun gun on the knifeman who immediately fell to the ground.
According the The Metropolitan Police, the man was arrested on suspicion of causing an affray.
The Queen and Prince Philip were at Sandringham at the time.