Mayor of Paris Anne Hidalgo (C,L) and the Mayor of the 8th arrondissement of Paris Jeanne d'Hauteserre (C,R) lay flowers as they pay their respect at the site of a shooting on the Champs Elysees in Paris on April 21, 2017, a day after a gunman opened fire on police along the avenue, killing a policeman and wounding two others in an attack claimed by the Islamic State group just days before the first round of the presidential election. / AFP PHOTO / FRANCOIS GUILLOT        (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)