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China's food regulator has visited close to 600 restaurants, businesses and food distributors as it investigates a fast-spreading food safety scare that has dragged in a number of global brands and hit food outlets as far away as Japan. Hong Kong said on Thursday it suspended, with immediate effect, all imports from the U.S.-owned Chinese supplier at the center of the latest scare. It was unclear when the company last shipped its products to Hong Kong. Shanghai police detained five people on Wednesday, including the head and the quality chief of Shanghai Husi Food, a supplier to foreign fast-food brands including KFC, McDonald's Corp and coffee chain Starbucks Corp over allegations it supplied out-of-date meat.