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HONG KONG - FEBRUARY 01: Journalists wait outside the Causeway Bay Bookstore on February 1, 2016 in Hong Kong, Hong Kong. The bookshop co-owned by missing bookseller Lee Po reopened on Monday after being closed for more than a month. Chinese police officials acknowledged Lee's presence in China on Friday, stating that he was in the mainland of his own free will, but offered no new information about his situation. (Photo by Lam Yik Fei/Getty Images)

HONG KONG - FEBRUARY 01:  Journalists wait outside the Causeway Bay Bookstore on February 1, 2016 in Hong Kong, Hong Kong. The bookshop co-owned by missing bookseller Lee Po reopened on Monday after being closed for more than a month. Chinese police officials acknowledged Lee's presence in China on Friday, stating that he was in the mainland of his own free will, but offered no new information about his situation.  (Photo by Lam Yik Fei/Getty Images)