The Metropolitan Police have confirmed eight people have been arrested in connection with the terror attack on Westminster.
Six addresses were raided overnight as police searched for those behind the atrocities in central London.
At one of the raid locations, a flat in Hagley Road, Birmingham, one witness is said to have told the Press Association: "The man from London lived here."
The vehicle used in the attack is also believed to have been hired in Birmingham.
Scotland Yard - specifically Mark Rowley, a senior anti-terror officer for the Met - have confirmed that in addition to this address, five other addresses in London, Birmingham, and "elsewhere" thought to be associated with the assault on Westminster were raided overnight.
Rowley said he believed the attacker worked alone to commit the atrocity, adding that he thought the man was influenced by "international terrorism".
He insisted there was no information to suggest there are any further public threats, and maintained the investigation was developing.
Four people were killed, as was the attacker, and up to 40 injured after a man drove a car through pedestrians on Westminster Bridge, before moving the attack into Parliament's New Palace Yard where he fatally stabbed PC Keith Palmer before being shot dead himself.
Both the House of Lords and the House of Commons will sit at normal times on Thursday in a defiant gesture.