People and officials attend a gathering, organised by the CRIF Jewish organisation, in memory of Mireille Knoll, in Paris, France, March 28, 2018. Mireille Knoll, 85, was found dead with 11 stab wounds at her apartment in a working-class district of Paris on Friday. The apartment was set ablaze after the attack and her body badly burnt. Police suspect that Knoll's Jewish religion was a motive for the killing. REUTERS/Gonzalo Fuentes