The founder of WikiLeaks said on Friday he fears the United States is preparing to indict him, but insisted that the government secret-spilling site would continue its work despite what he calls a dirty tricks campaign against him.

Julian Assange spoke from snowbound Ellingham Hall, a supporter's 10-bedroom country mansion where he is confined on bail as he fights Sweden's attempt to extradite him on allegations of rape and molestation.

He insisted to television interviewers that he was being subjected to a smear campaign and "what appears to be a secret grand jury investigation against me or our organization."

Attorney General Eric Holder has said repeatedly a criminal investigation of the WikiLeaks' continuing release of some 250,000 secret U.S. State Department cables is under way and that anyone found to have broken the law will be held accountable.

The Justice Department has provided no other public comment on who is under investigation or its legal strategy.

If pursued, the case could pit the government's efforts to protect sensitive information against press and speech freedoms guaranteed by the U.S. Constitution's First Amendment.

The government suspects WikiLeaks received the documents from an Army private, Bradley Manning, who is in the brig on charges of leaking other classified documents to the organization.

Assange did not elaborate on the rumored grand jury investigation, but said he had retained an unspecified U.S. law firm to represent him.

A British High Court judge freed Assange on bail Thursday on condition he reside at the 600-acre estate in eastern England, wear an electronic tag and report to police daily.

Assange spent nine days in prison after handing himself in to British police on Dec. 7. He is wanted in Sweden for questioning about sex allegations leveled against him by two women he spent time with while visiting the country in August.

Swedish officials — and the lawyer for the women involved — have denied accusations from Assange and his supporters that the allegations are politically motivated.

Attempts to reach Assange's British lawyers weren't immediately successful Friday.

In an interview Friday on ABC's "Good Morning America," Assange said he had never heard Manning's name until the press began reporting it, although in another interview at Ellingham Hall he appeared close to acknowledging he was one of WikiLeaks' sources.

He called him "a young man somehow embroiled in our publishing activities."

"We can see that he's the only person, only one of our military sources, who has been accused," he said.

Assange has also warned of a smear campaign, saying that he expected new allegations about him to surface sometime Friday. It wasn't immediately clear what he was referring to, and no fresh accusations had been made public by early evening in Europe.

However, Assange's personal life — and that of his accusers — have been under intense scrutiny since the Sweden rape allegations first became known, and in the past few days new details have leaked to the Web.

Online gossip site Gawker.com has published what it claims are Assange's profile on matchmaking website OKCupid.com and excerpts from e-mails it said he exchanged with a young female love interest from several years back. The sometimes cringe-inducing details have been an online sensation.

WikiLeaks did not immediately respond to a query about why it was helping to drive traffic to a site which appears to denigrate an alleged sex crime victim.

Assange, a globe-trotting activist who once described himself as a homeless refugee, may have to stay at Ellingham Hall for a long time. His next hearing is set for early January and his extradition is due to be decided the following month. Appeals could drag the process out even further.

In the meantime, Assange will remain as the guest of Vaughan Smith, a former army captain and supporter who also runs the Frontline Club, a well-known journalists' hangout.

The 18th century house, which has been in Smith's family for generations, hosts an organic farm that supplies the Frontline's well-reviewed restaurant.

Arriving just as his curfew came into force Thursday night, Assange told reporters he was looking forward to spending Christmas at Ellingham.

Although he chafed against the conditions of his bail — describing them as tantamount to "high-tech house arrest" — he was quoted by the BBC as saying he looked forward to doing some fishing.

More to the point, WikiLeaks spokesman Kristinn Hrafnsson said the house had a decent Internet connection, enabling Assange to get back to work coordinating the release of the 250,000 U.S. Embassy cables, the overwhelming majority of which remain unpublished.