A gunman armed with an automatic weapon has killed six people and injured at least 14 in a mass shooting in Ukraine's capital before he was shot and killed by police. The attacker barricaded himself inside a supermarket with hostages after opening fire in a busy central district near an apartment block and shopping center in Kyiv on Saturday. Authorities said the suspect, a 58-year-old man born in Russia, had a prior criminal record but gave no other details. Ukrainian police ended a 40-minute standoff by storming the store. Officials continue investigating the motive behind the deadly shooting.