Australia’s prime minister on Saturday hailed the “hero” police officer who stopped a vicious knife attack at a Sydney shopping mall that claimed at least seven lives, incuding the killer. “She is certainly a hero. There is no doubt that she saved lives through her action,” said Prime Minister Anthony Albanese, who called the murderous attack a “horrific act of violence indiscriminately targeting innocent people going about an ordinary Saturday.” New South Wales Police Commissioner Anthony Cooke also praised the officer at the same press conference who “took action, saving a range of people’s …