Thousands of Londoners gathered in Trafalgar Square for a candlelit vigil after the terrorist attack Wednesday on Westminster Bridge near Parliament.
One of the injured victims, a 75 year old man; succumbed to his injuries yesterday, bringing the death toll to four plus the attacker.
Police say 52 year old Khalid Masood had a criminal record.
Prime Minister Theresa May revealed Masood was once linked to violent extremism, adding that the attack was thought to have been inspired by Islamist ideology.