In the Nanking Massacre, Japanese soldiers were said to have sexually assaulted Chinese women who were trapped in the city of Nanjing when it fell to the Japanese on 13 December 1937. The International Military Tribunal for the Far East estimated that 20,000 women, children, were raped or otherwise sexually assaulted during the occupation. Iris Chang estimated that the number of Chinese women raped by Japanese soldiers ranged from 20,000 to 80,000. Chuo University professor Yoshiaki Yoshimi states there were about 2,000 centers where as many as 200,000 Japanese, Chinese, Korean, Filipino, Taiwanese, Burmese, Indonesian, Timorese, Papuan, Microensian, Dutch and Australian women were interned and used as sex slaves.