by Dmitry Serebryakov Agence France Presse KEMEROVO, Russia (AFP) — Russia holds a day of national mourning Wednesday for the dozens of victims of a Siberia shopping center fire, as calls multiply for the sacking of negligent officials and a thorough probe into blatant safety violations. Russian President Vladimir Putin took the unusual step — for him — of visiting the Siberian industrial city of Kemerovo, where the tragedy occurred, and faced emotional questions about […]