Part of Parliament Square could be pedestrianised in the wake of the latest suspected Westminster terror attack, Britain's most senior police officer has said.

Metropolitan Police Commissioner Cressida Dick said the move to ban vehicles from the road in front of the Houses of Parliament could be made in a bid to prevent further vehicle attacks - terrorists' "weapon of choice".

A 29-year-old UK national - named as Salih Khater, a former Sudanese migrant - remains in police custody following his arrest on suspicion of preparing an act of terror after crashing a silver Ford Fiesta. Police revealed on Wednesday that he has been further arrested on suspicion of attempted murder.

Addresses in the Midlands have been searched as police investigate the crash outside the Houses of Parliament in a suspected terror attack on Tuesday morning.

The Fiesta was driven from Birmingham to London late on Monday, spent almost five hours in the Tottenham Court Road area and was then driven around the Westminster area for more than 90 minutes, before it crashed into a security barrier just before 7.40am.