U.S. says 'not at all concerned' about Japan's plutonium

VIENNA (Reuters) - The United States is not worried about Japan's plutonium stocks, a senior U.S. diplomat said on Wednesday, following criticism raised by China in a new dispute between the east Asian neighbours.

"We are not at all concerned that the plutonium is either being handled improperly or that there isn't a plan for disposition," Joseph Macmanus, the U.S. ambassador to the U.N. nuclear agency, told reporters in response to a question.