A cornered off area containing knives, a hat and Taser wire outside Buckingham Palace in central London after a man armed with two knives was stunned by police, Sunday Feb. 3, 2013. Scotland Yard said the man, thought to be in his 50s, acted aggressively when challenged by police outside the gates of the heavily touristed landmark on Sunday. Queen Elizabeth II and her husband Prince Philip were at their country retreat, Sandringham Estate, at the time. (AP Photo/Jonathan Brady/PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

Associated Press
A cornered off area containing knives, a hat and Taser wire outside Buckingham Palace in central London after a man armed with two knives was stunned by police, Sunday Feb. 3, 2013. Scotland Yard said the man, thought to be in his 50s, acted aggressively when challenged by police outside the gates of the heavily touristed landmark on Sunday. Queen Elizabeth II and her husband Prince Philip were at their country retreat, Sandringham Estate, at the time.  (AP Photo/Jonathan Brady/PA)  UNITED KINGDOM OUT - NO SALES - NO ARCHIVES
A cornered off area containing knives, a hat and Taser wire outside Buckingham Palace in central London after a man armed with two knives was stunned by police, Sunday Feb. 3, 2013. Scotland Yard said the man, thought to be in his 50s, acted aggressively when challenged by police outside the gates of the heavily touristed landmark on Sunday. Queen Elizabeth II and her husband Prince Philip were at their country retreat, Sandringham Estate, at the time. (AP Photo/Jonathan Brady/PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES
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