Hundreds of people assembled at Trafalgar Square in the City of Westminster, in Central London, to pay their respects to the victims of the terrorist attack in Westminster. 

An unidentified man on Wednesday plowed into a crowd of people with a car in Central London, and, subsequently, attacked a policeman with a knife, whereupon police killed the attacker.

Four people were killed, including the attacker and a police officer.

Later, this attacker was identified as British citizen Khalid Masood, 52.

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