A gunman who killed at least six people in the streets of Kyiv on Saturday before taking hostages and barricading himself in a nearby supermarket has been shot dead by police, Ukrainian officials said.The head of Ukraine’s Interior Ministry, Ihor Klymenko, said in a statement on social media that special tactical police units stormed the store after attempts to contact the gunman with a negotiator failed.The attacker was killed while resisting arrest, he said.Speaking to reporters at the...