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Armed police have launched a late-night raid on an address in Birmingham.

West Midlands Police referred inquiries about the operation on Hagley Road to the Metropolitan Police, who refused to say whether it was connected with Wednesday’s attack in Westminster.

But a witness who works nearby told the Press Association: “The man from London lived here.”

Officers stormed a second-floor flat above a row of shops on Hagley Road at around 11pm, the witness said.

He added: “They came and arrested three men.”

One of the flat’s windows was covered in cardboard, with non-uniformed officers spotted taking pieces of equipment into the property.

As he was describing the events, the witness was interrupted by a police officer, who had been guarding the scene.

He had his details taken and was convinced to go to a police station with another officer.