LONDON, ENGLAND - MARCH 23: People attend a candlelit vigil at Trafalgar Square on March 23, 2017 in London, England. Four people were killed in Westminster, London, yesterday in a terrorist attack by Khalid Masood. Three of the victims have been named as police officer Keith Palmer, tourist Kurt Cochran from Utah and a Spanish teacher Aysha Frade. (Photo by Kate Green/Anadolu Agency/Getty Images)
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