Australian police and intelligence agencies are investigating a suspected industrial espionage case at the country's top scientific organisation involving a Chinese national. The probe reportedly centres on a post-doctoral student who, until last week, worked in the Commonwealth Scientific and Industrial Research Organisation's (CSIRO) highly sensitive nanotechnology laboratory in Melbourne. Sources said that the student was a Chinese national. The revelation could further test ties with Beijing, which reacted angrily last week when Australia called in China's ambassador over its establishment of an air defence zone over the East China Sea. "CSIRO became aware of a matter involving an employee suspected of unauthorised use of CSIRO computers," the organisation said. "We consider this a very serious matter and have referred it to the Australian Federal Police. It is not appropriate for us to release any further details at this time." The Sydney Morning Herald said a focus of the intelligence probe was to determine whether the man sent CSIRO information to a foreign power. The organisation's nanotechnology section works closely with Australia's Defence Science and Technology Organisation. CSIRO has also collaborated with leading Chinese universities on nanotechnology projects in recent years, the Herald said.