>> Four people killed, around 40 injured, and police raids taking place across the country. I'm Reuters' Jacob Greaves reporting from Westminster, now the scene of the bloodiest attack on British soil since July 2005. The very latest police briefing we're hearing says there's been seven arrests made across six addresses.
It's focused around Birmingham and London, the police continuing to investigate Wednesday's events. They say they believe to know the identity of the attacker, but haven't yet made that information public. They do however stress they think he acted alone, inspired by international terrorism. We're gaining an increasingly more detailed picture of the events on Wednesday afternoon.
The perpetrator in a vehicle careering across Westminster Bridge knocking down bystanders before he slammed into the perimeter fence of the Houses of Parliament before getting out of the vehicle and trying to breach the perimeter security there. He stabbed a policeman, who died of his injuries, before being shot by armed policemen at the scene.
The attacker later succumbing to his injuries.