Japan is in final negotiations with Beijing to pay around 300 million yen for the victims of an August poison gas leak from Japanese wartime chemical weapons left behind in China, government sources said Friday.

"We have been negotiating the issue in Beijing, and we will deal with it positively and hope to reach an agreement as soon as possible," Deputy Chief Cabinet Secretary Masaaki Yamazaki said at a news conference Friday afternoon.

In August, a mustard gas leak at a construction site in Qiqihar, Heilongjian Province, killed a man and injured 40 others.