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LONDON, ENGLAND - MARCH 22: People are seen in Westminster Abbey Cathedral after being brought from the Houses of Parliament by police on March 22, 2017 in London, England. At least one man was shot dead by police outside the U.K. parliament Wednesday afternoon after stabbing a police officer, said Commons Leader David Lidington. Parliament Square is under a complete security lockdown with all entrances and exits suspended, with all roads into the square cordoned off by police. (Photo by Inci Gundag/Anadolu Agency/Getty Images)

LONDON, ENGLAND - MARCH 22: People are seen in Westminster Abbey Cathedral after being brought from the Houses of Parliament by police on March 22, 2017 in London, England. At least one man was shot dead by police outside the U.K. parliament Wednesday afternoon after stabbing a police officer, said Commons Leader David Lidington. Parliament Square is under a complete security lockdown with all entrances and exits suspended, with all roads into the square cordoned off by police. (Photo by Inci Gundag/Anadolu Agency/Getty Images)