Japan and China will hold another round of working-level talks Tuesday in Beijing over last month's fatal mustard gas leak, the Foreign Ministry said Monday. The mustard gas was left in China by the Japanese military at the end of World War II.

Prime Minister Junichiro Koizumi pledged last week that Tokyo would deal with the incident in a sincere manner.

Koizumi made this commitment during a meeting Friday in Tokyo with Wu Bangguo, chairman of China's Standing Committee of the National People's Congress.

The poison gas leak occurred Aug. 4, when workers at a construction site in Qiqihar, Heilongjiang Province, uncovered five barrels that had apparently been left in the area by the Imperial Japanese Army in the closing days of the war.

The incident killed one man and injured more than 40 other people. The two countries held talks last week without reaching any concrete agreements.