UK police have made seven arrests after Wednesday's terror attack on Westminster in London.
It follows raids in Birmingham and London.
Police have also revised the number of dead in the incident to four, including the attacker.
The assailant drove a vehicle into passersby on Westminster Bridge before stabbing a policeman at Parliament.
Mark Rowley of London's Metropolitan Police says details are becoming clearer.
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Mark Rowley of London's Metropolitan Police says the investigation is moving quickly.
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