A man in his 30s has been taken to hospital with burns after he's believed to have cut through a power cable, which caused an explosion near Shaftsbury Avenue.
It happen just before 12:45 this afternoon. More to follow.
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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.