6 Killed As Gunman Takes Hostages, Opens Fire In Supermarket In Kyiv  NDTVAt least six killed in Kyiv as gunman opens fire and takes hostages  BBCInvestigators examine whether Ukraine terrorist attack was directed by Russia  The GuardianFour people were killed in a shooting in Kyiv  news.cgtn.comUkraine police shoot dead gunman who killed six in Kyiv, took hostages  Al Jazeera