The Queen will be joined by members of the royal family for the annual Order of the Garter service today.
The sight of Garter Knights walking through the grounds of Windsor Castle wearing their lavish blue velvet robes and black velvet hats with white plumes is a colourful spectacle that attracts hundreds of people.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.