Japanese war mourners include left-behind kids adopted by Chinese

A group from Japan mourned victims of Japan's invasion and occupation of northeastern China before and during World War II and called on their leaders to visit China to apologize for war crimes on Tuesday.

The group of 41 was organized by people abandoned as children in China by Japanese families at the end of the war, and included three of them who had returned to Japan. The visit took place on Qingming Festival, the most important occasion for Chinese to honor the dead.

They visited Unit 731 Museum in Harbin, capital of Heilongjiang province, and mourned the more than 3,000 people tortured and killed there. Unit 731 was the Japanese army's germ warfare division, which engaged in experiments on humans.