UNITED KINGDOM, London: 26 January 2016 A guest listens to Holocaust survivor Hannah Lewis tell her story in The Chamber of City Hall during a memorial service to remember victims of the Holocaust this morning. The Mayor of London, Boris Johnson, joined members of the London Assembly as well as Holocaust survivors to mark 71 years since the liberation of Auschwitz-Birkenau and to pay tribute to victims of other subsequent genocides. Rick Findler / Story Picture Agency