The head of Ukraine's patrol police, Yevhen Zhukov, has resigned following criticism of two officers who allegedly fled a mass shooting in Kyiv on Saturday rather than confronting the attacker. A 58-year-old gunman opened fire on pedestrians in the city's Holosiivskyi district, killing six people and wounding 14 others, before taking hostages in a nearby supermarket; he was later shot dead by police. President Volodymyr Zelensky condemned the officers' "inaction," Interior Minister Igor Klymenko suspended them pending an investigation, and Zhukov said he resigned because the officers had "acted unprofessionally and unworthily" by leaving civilians in danger.