Police in Japan are examining whether a man who went on a stabbing spree in Tokyo warned of his actions on an internet site, media reports say. Seven people died and 10 others were injured in the attack in central Tokyo's Akihabara shopping district on Sunday. Twenty-five year-old Tomohiro Kato was arrested by police at the scene. Mourners have begun to leave tributes at the site of the attack, wh


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