A pro-democracy demonstrator burns a letter next to pictures of missing staff members of a publishing house and a bookstore, including Gui Minhai, a China-born Swedish national who is the owner of Mighty Current, Cheung Jiping, the business manager of the publishing house and Causeway Bay Books shareholder Lee Bo (L-R), during a protest to call for an investigation behind their disappearance, outside the Chinese liaison office in Hong Kong, China January 3, 2016. REUTERS/Tyrone Siu
HONG KONG (Reuters) - A publisher of books critical of China's leaders who went missing in Hong Kong last week has travelled to China voluntarily, his wife said on Tuesday, as Britain reminded its former colony of its commitment to press freedom.
Four other associates of the publisher that specializes in selling and publishing gossipy political books on China's Communist Party leaders have been unaccounted for since late last year.
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