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