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Protestors hold up missing person notices of (L-R) Mighty Current publisher of books critical of China company's general manager Lui Bo and colleagues Cheung Jiping, Gui Minhai, Lee Bo and Lam Wing-kei as they walk towards China's Liaison Office in Hong Kong on January 3, 2016. Five missing Hong Kong booksellers were rumoured to have been planning a book about Chinese President Xi Jinping's relationship with a former girlfriend, one of the city's lawmakers said on January 3, as protesters gathered to voice anger over the case.  AFP PHOTO / ANTHONY WALLACE / AFP / ANTHONY WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
Protestors hold up missing person notices of (L-R) Mighty Current publisher of books critical of China company's general manager Lui Bo and colleagues Cheung Jiping, Gui Minhai, Lee Bo and Lam Wing-kei as they walk towards China's Liaison Office in Hong Kong on January 3, 2016. Five missing Hong Kong booksellers were rumoured to have been planning a book about Chinese President Xi Jinping's relationship with a former girlfriend, one of the city's lawmakers said on January 3, as protesters gathered to voice anger over the case.  AFP PHOTO / ANTHONY WALLACE / AFP / ANTHONY WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

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    Concerns over missing Hong Kong booksellers

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Concerns over missing Hong Kong booksellers

Demonstrators in Hong Kong are demanding answers over the disappearance of five booksellers, reportedly critical of the Chinese Communist Party. CNN's Ivan Watson reports.

Concerns over missing Hong Kong booksellers

Demonstrators in Hong Kong are demanding answers over the disappearance of five booksellers, reportedly critical of the Chinese Communist Party. CNN's Ivan Watson reports.