London (CNN)Four people were killed and scores injured when an attacker plowed a car through crowds in central London before attempting to storm the Houses of Parliament in what police believe was an act of Islamist-inspired terrorism.

Police indicated they knew the identity of the assailant, who fatally stabbed unarmed police officer Keith Palmer, a 15-year-veteran, on the grounds of Parliament after ramming a car onto the crowded sidewalks nearby. Armed officers shot the attacker dead.

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