WikiLeaks faces a "very aggressive" and secretive investigation by US authorities stung by a perceived loss of face following the release of thousands of secret American diplomatic cables, the organisation's founder, Julian Assange, said today.

Speaking to reporters outside Ellingham Hall, the Norfolk house at which he is staying on bail following his release from prison, Assange said WikiLeaks faced "what appears to be an illegal investigation ... certain people who are alleged to be affiliated to us have been detained, followed around, had their computers seized and so on", London's Guardian newspaper reported.

He said he believed it was "80% likely" that the US authorities were seeking to prepare an attempt to have him extradited there to face charges of espionage.

He added that he was reliant on public opinion to rein in "a superpower that does not appear to be following the rule of law".

"I would say that there is a very aggressive investigation, that a lot of face has been lost by some people, and some people have careers to make by pursuing famous cases, but that is actually something that needs monitoring," he said.

He criticised the way Swedish authorities have sought to have him extradited to Sweden to face allegations of sexual assault – the reason he was held in jail for 10 days.

Read the entire story at guardian.co.uk