'No way the public knew' about alleged hacking by China
19 February 2013 Last updated at 11:11 GMT
A computer security company based in the US believes the Chinese military is behind a series of high-level cyber-hacking attacks.
Mandiant says it has pinpointed a secretive unit of the Chinese People's Liberation Army as the most likely source of the attacks, which have lifted data from a range of industries, mostly in the US.
Raymond Li, editor of the BBC's Chinese service, said: "This is the first time we've seen such a specific accusation against the Chinese military."