LONDON, England — The Islamic State group claimed responsibility Thursday for an attack by a man who plowed an SUV into pedestrians on a crowded London bridge and then stabbed a police officer to death on the grounds of Britain’s Parliament.

The attacker was born in Britain and known to authorities who had once investigated him for links to religious extremism, British Prime Minister Theresa May said Thursday in a sweeping speech in which she also encouraged Britons to go about their lives.

The Islamic State group said through its Aamaq News Agency that the attacker was a soldier of the Islamic State who “carried out the operation in response to calls for targeting citizens of the coalition” of countries fighting IS in Syria and Iraq. In addition to the police officer and the attacker, who was shot by police, two people died on Westminster Bridge and at least 30 others were injured, seven critically.

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div class='origin-logo' data-origin='none'/divspan class='caption-text' data-credit='Stefan Rousseau/PA via AP'A man is treated by emergency services, as a knife lays on the floor, outside the Houses of Parliament London, Wednesday, March 22, 2017./span/div
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div class='origin-logo' data-origin='none'/divspan class='caption-text' data-credit='Victoria Jones/ PA via AP'Mark Rowley, Assistant Commissioner for Specialist Operations in the Metropolitan Police, speaks to the media outside Scotland Yard in London, Wednesday, March 22, 2017.

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