WASHINGTON, Nov 15 (Reuters) - American prosecutors have obtained a sealed indictment against Wikileaks founder Julian Assange, whose website published thousands of classified U.S. government documents, a U.S. federal court document showed on Thursday.
The document, which prosecutors say was filed by mistake, asks a judge to seal documents in a criminal case unrelated to Assange, and carries markings indicating it was originally filed in U.S. District Court in Alexandria, Virginia in August.
A source familiar with the matter said the document was initially sealed but unsealed this week for reasons that are unclear at the moment.
On social network Twitter, Wikileaks said it was an "apparent cut-and-paste error."
U.S. officials had no comment on the disclosure in the document about a sealed indictment of Assange. It is unclear what charges Assange faces.
WikiLeaks founder Julian Assange makes a speech from the balcony of the Ecuadorian Embassy, in central London, Britain February 5, 2016. REUTERS/Peter Nicholls/Files
A supporter of Wikileaks founder Julian Assange holds a banner outside the Ecuadorian embassy in London as he marks three years since Assange claimed asylum in the embassy on June 19, 2015. WikiLeaks founder Julian Assange clocks up three years inside the Ecuadoran embassy in London today, after claiming that Swedish prosecutors cancelled a landmark meeting in his case earlier this week. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
A supporter of Wikileaks founder Julian Assange holds banners outside the Ecuadorian embassy in London as he marks three years since Assange claimed asylum in the embassy on June 19, 2015. WikiLeaks founder Julian Assange clocks up three years inside the Ecuadoran embassy in London today, after claiming that Swedish prosecutors cancelled a landmark meeting in his case earlier this week.
AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
Julian Assange, Founder and Editor-in-Chief of WikiLeaks speaks via video link during a press conference on the occasion of the ten year anniversary celebration of WikiLeaks in Berlin, Germany, October 4, 2016. REUTERS/Axel Schmidt TPX IMAGES OF THE DAY
WikiLeaks founder Julian Assange appears on screen via video link during his participation as a guest panelist in an International Seminar on the 60th anniversary of the college of Journalists of Chile in Santiago, Chile, July 12, 2016. REUTERS/Rodrigo Garrido
File photo dated 05/02/16 of WikiLeaks founder Julian Assange, who will publish more confidential documents on the US Central Intelligence Agency once a "key attack code" has been disarmed, he has revealed.
File photo dated 5/2/2016 of Julian Assange who has defended the release of emails by WikiLeaks about US presidential candidate Hillary Clinton.
WikiLeaks founder Julian Assange speaking from the balcony of the Ecuadorian Embassy in London where he has been living for more than three years after the country granted him political asylum.
BERLIN, GERMANY - OCTOBER 4: WikiLeaks founder Julian Assange participates via video link at a news conference marking the 10th anniversary of the secrecy-spilling group in Berlin, Germany on October 4, 2016.
(Photo by Maurizio Gambarini/Anadolu Agency/Getty Images)
The Spanish journalist Ignacio Ramonet presents in Quito, Ecuador, on June 23, 2016 the Ecuador 's book " When Google found Wikileaks". Julian Assange made his appearance to the world in 2010 with the publication by WikiLeaks of thousands of secret documents revealing conspiracies , corruption, crimes , lies, and incriminate several governments and particularly the United States as the main actor illegalities. (Photo by Rafael Rodrï¿½uez/ACGPHOTO/NurPhoto via Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Wikileaks founder Julian Assange prepares to speak from the balcony of the Ecuadorian embassy where he continues to seek asylum following an extradition request from Sweden in 2012, on February 5, 2016 in London, England. The United Nations Working Group on Arbitrary Detention has insisted that Mr Assange's detention should be brought to an end. (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: A panel of WikiLeaks representitives and press look on as WikiLeaks founder Julian Assange speaks at a press conference at the Frontline Club via video link from the Ecuadorian Embassy in London on 5 February 2016 in London, England. Mr Assange's speech comes a day after it was announced that the UN panel ruled he was being unlawfully detained at the Ecuadorian Embassy. (Photo by Chris Ratcliffe/Getty Images)
Australian founder of whistleblowing website, 'WikiLeaks', Julian Assange speaks to media after giving a press conference in London on July 26, 2010. The founder of a website which published tens of thousands of leaked military files about the war in Afghanistan said Monday they showed that the 'course of the war needs to change'. In all, some 92,000 documents dating back to 2004 were released by the whistleblowers' website Wikileaks to the New York Times, Britain's Guardian newspaper, and Germany's Der Spiegel news weekly. Assange also used a press conference in London to dismiss the White House's furious reaction to the disclosures. AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL/AFP/Getty Images)
MELBOURNE, AUSTRALIA - MAY 21: (AUSTRALIA OUT) Wikileaks founder Julian Assange poses during a portrait shoot on May 21, 2010 in Melbourne, Australia. (Photo by Mark Chew/Fairfax Media/Fairfax Media via Getty Images).
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But Joshua Stueve, a spokesman for the prosecutors' office which filed the document that was unsealed, told Reuters, "The court filing was made in error. That was not the intended name for this filing."
Reuters was unable to immediately reach Assange or his lawyers to seek comment.
Prosecutors sought to keep the charges confidential until after Assange's arrest, the document shows, saying the move was essential to ensure he did not evade or avoid arrest and extradition in the case.
Any procedure "short of sealing will not adequately protect the needs of law enforcement at this time because, due to the sophistication of the defendant, and the publicity surrounding the case, no other procedure is likely to keep confidential the fact that Assange has been charged," the document reads.
It adds, "The complaint, supporting affidavit, and arrest warrant, as well as this motion and the proposed order, would need to remain sealed until Assange is arrested in connection with the charges in the criminal complaint and can therefore no longer evade or avoid arrest and extradition in this matter."
U.S. officials have previously acknowledged that federal prosecutors based in Alexandria have been conducting a lengthy criminal investigation into WikiLeaks and its founder.
Representatives of the U.S. administration of President Donald Trump, including Secretary of State Mike Pompeo, have publicly called for Assange to be aggressively prosecuted.
Assange and his supporters have periodically said U.S. authorities had filed secret criminal charges against him, an assertion against which some U.S. officials pushed back until recently.
Facing extradition from Britain to Sweden to be questioned in a sexual molestation case, Assange six years ago took refuge in Ecuador’s London embassy, where initially he was treated as a welcome guest.
But following a change in the government of the south American nation, Ecuadorean authorities last March began to crack down on his access to outsiders and for a time cut off his internet access. (Additional reporting by Brendan O'Brien in Milwaukee; Editing by Clarence Fernandez)