Undated handout photo released by Metropolitan Police on Wednesday, March 22, 2017 of police officer Keith Palmer who was killed during the attack on the Houses of Parliament in London. A knife-wielding man went on a deadly rampage in the heart of Britain's seat of power Wednesday, plowing a car into pedestrians on London's Westminster Bridge before stabbing a police officer to death inside the gates of Parliament. Five people were killed, including the assailant, and 40 others were injured in what Prime Minister Theresa May condemned as a "sick and depraved terrorist attack." (Metropolitan Police via AP)
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