NANJING, Sept. 17 -- China's National Memorial, a website designed to promote the commemoration of the Nanjing Massacre in World War II, launched its Russian, French, German and Korean editions on Wednesday.

The website (www.cngongji.cn), sponsored by the Memorial Hall of the Victims in Nanjing Massacre by Japanese invaders and Xinhua News Agency website Xinhuanet.com, launched its Chinese, English and Japanese editions on July 6.

It aims to promote international understanding of the history and reflection on the war, said Zhu Chengshan, curator of the memorial Hall.

Its mobile app in Chinese, English and Japanese languages was launched on Sept. 2 and allows users to access the museum's website via smart phones.

By Wednesday, the National Memorial website had logged more than 40 million clicks, with 1.7 million participating in digital mourning activities, according to Zhu.

The Nanjing Massacre is a six week period in late 1937 which saw Japanese soldiers kill more than 300,000 people in the city of Nanjing in east China's Jiangsu province, then capital of China.

One website function allows users to log in and participate in digital candle-lighting and tree planting as part of mourning process for the victims.

China's top legislature in February this year set December 13 as a national memorial day for Nanjing Massacre victims.