BEIJING, Jan. 24 (Xinhua) -- China National Tourism Administration on Tuesday asked all outbound travel agencies and websites to stop cooperating with a right-wing Japanese hotel chain.

The APA hotel chain recently began leaving a controversial book, on the 1937 Nanjing Massacre and comfort women, in its hotel rooms.

"The APA's move is a blatant provocation and violates fundamental ethical principles," said Zhang Lizhong, spokesperson for the administration.

The administration's Japanese office has lodged a solemn representation to Japan, demanding the removal of the right-wing books, he said.

Outbound travel agencies and online platforms have been asked to stop cooperating with the hotel, Zhang said, and Chinese tourists have been urged to boycott the chain.