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A member of staff walks outside the Four Seasons Hotel in Hong Kong on February 1, 2017. A Chinese billionaire has been abducted in Hong Kong by mainland agents, according to reports on January 31, triggering more concerns over security in the city after the disappearance of five booksellers. Financier Xiao Jianhua, founder of Beijing-based Tomorrow Group, was staying long-term at Hong Kong's luxury Four Seasons hotel, according to reports in overseas Chinese-language media. / AFP / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

A member of staff walks outside the Four Seasons Hotel in Hong Kong on February 1, 2017.
A Chinese billionaire has been abducted in Hong Kong by mainland agents, according to reports on January 31, triggering more concerns over security in the city after the disappearance of five booksellers. Financier Xiao Jianhua, founder of Beijing-based Tomorrow Group, was staying long-term at Hong Kong's luxury Four Seasons hotel, according to reports in overseas Chinese-language media.  / AFP / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)