sentences:  In November 1997 at a conference in Princeton University Hata was confronted by Iris Chang, author of the book "The Rape of Nanking", who asked him why he doubted the testimony of Japanese POWs who had stated that hundreds of thousands of Chinese were killed in the atrocity.When Hata replied that torture and coercion of Japanese POWs made their testimony unreliable Chang walked out and the audience became unruly, shouting Hata down and yelling insults at him.The moderator Perry Link barely kept the situation under control.