Hong Kong (CNN)One of the Hong Kong booksellers who had gone mysteriously missing has met with his wife in mainland China, Hong Kong police confirmed to CNN.

Lee Bo, 65, was one of five men who work at a publishing house critical of Beijing’s ruling elite to disappear in recent months, raising fears that he’d been detained by mainland Chinese authorities and further stoking concerns over decreasing freedom of speech in the city.

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Chinese authorities confirmed last week that Lee had crossed the border into the neighboring province of Guangdong. His wife informed Hong Kong police on Saturday night that she had met up with him, also passing on a letter purportedly written by him.

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Source cnn.com