BEIJING -- A Chinese government official said on Thursday that the evidence for the Nanjing Massacre was "ironclad" in response to reports that a Japanese filmmaker in planning a documentary denying the atrocity.

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Chinese Foreign Ministry spokesperson Jiang Yu said Japan should take a correct and responsible attitude to history issues in order to win true trust from its Asian neighbors and the international community.

Jiang made the remarks when asked to comment on the plan to make the film about the Nanjing Massacre in December 1937, when Japanese troops killed 300,000 Chinese.

The film reportedly has the tentative title "The Truth About Nanking". The documentary aims to deny Japanese soldiers massacred Chinese civilians and prisoners of war in Nanjing.

Jiang said there was a mass of ironclad evidence for the Nanjing Massacre, and the international community had arrived at a final conclusion on it long ago.

It was in Japan's own interest to take a correct and responsible attitude, Jiang noted.

China had always advocated the development of friendly relations between the two countries, Jiang said.

This year marked the 35th anniversary of the normalization of diplomatic ties between China and Japan.

"We hope to maintain the momentum of improving Sino-Japanese relations by holding anniversary commemoration activities to promote bilateral communication and cooperation," Jiang said.