At least four people have died and at least twenty are injured after what police describe as a "terrorist incident" in central London.
A police officer and the suspected attacker are among the dead.
Police say a car drove along Westminster Bridge, hitting and injuring several people. The car then crashed near the Houses of Parliament and the attacker then stabbed a police officer.
Metropolitan Police Assistant Commissioner Mark Rowley said police believed there was only one attacker.
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Metropolitan Police Assistant Commissioner Mark Rowley said police patrols across London would increase in the coming days.
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