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A portrait of Xavier Jugele, the policeman killed by a jihadist in an attack on the Champs Elysees, is pictured during a ceremony on April 25, 2017 at the Paris prefecture building. French police officer Xavier Jugele was killed on the world-famous Paris avenue on April 20, in an attack claimed by the Islamic State group. (Photo by Julien Mattia/NurPhoto via Getty Images)

A portrait of Xavier Jugele, the policeman killed by a jihadist in an attack on the Champs Elysees, is pictured during a ceremony on April 25, 2017 at the Paris prefecture building. French police officer Xavier Jugele was killed on the world-famous Paris avenue on April 20, in an attack claimed by the Islamic State group.  (Photo by Julien Mattia/NurPhoto via Getty Images)