The March of the Beekeepers through Parliament Square comes ahead of a major vote in Brussels on Monday. Environment Secretary Owen Paterson is expected to vote against a ban on some neonicotinoid pesticides, which campaigners say are contributing to a decline in bee populations.
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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.