Crisis Chief Executive Leslie Morphy says the charity is expecting more than three thousand Londoners through the doors of its centres this Christmas. It will give them food, shelter and medical help at its nine centres which open this evening. More on London Tonight.
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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.