Austrian authorities were searching Wednesday for answers to why a 21-year-old gunman shot dead 10 people in a rampage at his former high school before killing himself, one of the worst outbreaks of violence in the country’s modern history. Police said the man, armed with a shotgun and a pistol, acted alone. They are scouring his home and the internet for clues to why he opened fire on the school in Austria’s second city of Graz

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