A collection of video material about the Nanjing Massacre is progressing and is expected to be completed by the end of the year, according to Zhu Chengshan, director of the Memorial Hall of the Victims of the Nanjing Massacre by the Japanese Invaders.

Zhu said that Japan's recent "purchase" of the Diaoyu Islands has spurred Chinese historians to collect more information about the massacre to confront Japan's right-wingers.

According to Zhu, only about 200 survivors of the massacre are still alive, and many of them are more than 80 years old.

The Nanjing Massacre took place on Dec 13, 1937, when Japanese troops occupied the then capital of China. More than 300,000 Chinese civilians and disarmed soldiers were killed.