Another associate of a Hong Kong bookshop specialising in titles critical of the
Chinese government appears to have disappeared.
Last month four other employees of the same bookshop and publishing house, including its owner, went missing.
Their colleagues believe they have been detained because of their work.
Freedom of the press is guaranteed in Hong Kong, but many in the publishing industry say they are beginning to feel pressure from mainland China.
The latest associate to be reported missing is the man who raised the alarm when his colleagues disappeared in October.
Image copyright BBC Chinese
Image caption The small shop is located in the busy Causeway Bay area
Mr Lee spoke to the BBC when his colleagues disappeared but did not want to disclose his full name at the time fearing reprisals.
He failed to arrive home on Wednesday evening and his wife has been unable to reach him. She told the BBC she is deeply afraid. [FULL STORY]