Under then President Clinton, In 1999, the USA accused Taiwanese-American nuclear physicist Wen Ho Lee, who worked at Los Alamos, of giving the design of Americas most-advanced nuclear warhead to China.
The charges were dropped by 2006 due to a lack of evidence but the incident sparked widespread unease among ethnic Chinese scientists at the laboratory.
One scientist who returned from Los Alamos was Professor Chen Shiyi, who as director of the State Key Laboratory for Turbulence and Complex Systems at Peking University played a key role in the development of Chinas hypersonic glide vehicle, a researcher at the Chinese Academy of Sciences (CAS) in Beijing.
China has already tested the hypersonic glide vehicle, capable of travelling at speeds of up to 11,000km/h about 10 times the speed of sound. At those speeds it could deliver a nuclear warhead anywhere on the planet in just over an hour too fast for any existing anti-missile system to respond to.