An anonymous reader writes: Hong Kong's South China Morning Post reports that Tsinghua University, widely regarded as the mainland’s top education and research institute, was the target of extensive hacking by US spies this year, according to information leaked by Edward Snowden. The information also showed that the attacks on Tsinghua University were intensive and concerted efforts. In one single day of January, at least 63 computers and servers in Tsinghua University have been hacked by the NSA. The university is home to one of the mainland’s six major backbone networks, the China Education and Research Network (CERNET) from where internet data from millions of Chinese citizens could be mined. Universities in Hong Kong and the mainland were revealed as targets of NSA’s cyber-snooping activities last week when Snowden claimed the Chinese University of Hong Kong had been hacked.