The Chinese authorities are launching an investigation into new evidence that China supplied nuclear secrets to Pakistan in the early 1980s. US government officials say material recently handed over to the United States by Libya includes documents purchased from Pakistani nuclear scientists. These documents were allegedly supplied to Pakistan by the Chinese in the 1980s. If the reports turn out to be true, this means China was in violation of the nuclear non-proliferation treaty. In its first official statement on the issue, the Chinese government has not denied the accusations.