Missing China tycoon's company says 'operating as normal,' shares slump

SHANGHAI/BEIJING (Reuters) - Listed firms controlled by Tomorrow Holdings, the company run by missing Chinese-born businessman Xiao Jianhua, slumped on Friday, despite the parent group saying its businesses were all operating normally. Mystery swirled around billionaire Xiao's whereabouts earlier this week, with some reports saying he had been abducted from Hong Kong and taken to mainland China. A statement purportedly from Xiao posted in a Hong Kong newspaper said he was seeking medical treatme