Police in London tasered a man who held a knife to his own throat outside Buckingham Palace today.
A spokesman for the Metropolitan Police said: "It was approximately 11.50am.
"A man was seen outside the centre gate in possession of two knives.
"He was not making threats to members of the public but he was challenged by police officers.
"He acted aggressively and a taser was discharged.
"He is thought to be in his fifties. He was arrested on suspicion of affray and has been taken to a central London police station."
A scene was cordoned off with police tape 30 metres from the palace gates and an ambulance was parked to the side of the building.
Police at the scene said that a man had "tried to make an exhibition of himself during the guard change" and that there were "mental health issues."
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