People pause to look at the newly installed permanent memorial to PC Keith Palmer, the police officer killed in the March 22, 2017 Westminster terror attack, outside the Houses of Parliament in London on February 21, 2019. - PC Keith Palmer was fatally stabbed as he stood guard in front of Britain's Houes of Parliament in Westminster on March 22, 2017 by Khalid Masood after the 52 year-old convert to Islam drove into pedestrians at high speed near parliament, killing four other people. (Photo by Tolga Akmen / AFP)
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