A Japanese academic testified at the U.N.-backed Khmer Rouge tribunal in Cambodia on Tuesday, giving an insight into forced marriage under the regime in the 1970s.

Kasumi Nakagawa spoke at the Extraordinary Chambers in the Courts of Cambodia, saying that while most accounts of the period had been given by men, stories from women's perspectives should be encouraged.

Nakagawa has written a book titled "Gender-Based Violence During the Khmer Rouge Regime."