Sweden reopened an investigation into a rape allegation against WikiLeaks founder Julian Assange yesterday and will seek his extradition from Britain.
The move could delay efforts by the United States to bring him to its courts to face trial over a huge release of secret documents.
Deputy Chief Prosecutor Eva-Marie Persson told a news conference that she would continue a preliminary investigation that was dropped in 2017 without charges being brought because Assange had taken refuge in the Ecuadorean embassy in London.
Assange was arrested in Britain last month after spending seven years hiding inside the embassy.
The United States is also seeking his extradition on conspiracy charges relating to the public release by WikiLeaks of a cache of secret documents, including assessments of foreign leaders, wars and security matters.
The Swedish prosecutor said it would request Assange be detained in his absence on probable cause for an allegation of rape and that it would issue a European arrest warrant - the process under which his extradition would be sought.
The 47-year-old Australian - who denies the allegations - is currently in a London prison serving 50 weeks behind bars for jumping bail when he fled to the Ecuadorean embassy in 2012.
The decision to reopen the investigation poses the question of whether Assange will be moved to Sweden or to the United States.
"I am well aware of the fact that an extradition process is ongoing in the UK and that he could be extradited to the US," Ms Persson said.
A British judge has given the US government a deadline of June 12 to outline its case against Assange.
The statute of limitation for rape in Sweden is 10 years - a deadline which would be reached in mid-August next year for the alleged incident involving Assange, leaving prosecutors pressed for time should they decide to file any formal charge.
"Everything depends on how this will be handled by the British authorities and courts," said Mark Klamberg, a professor of international law at Stockholm University.
"There is a possibility, or risk depending on how you see it, that this is going to take a long time," he said, adding that a US extradition of Assange would likely rule out him being tried in Sweden due to the statute of limitation.
Assange's supporters cast him as a dissident facing the wrath of a superpower over one of the largest compromises of classified information in US history.
Responding to the reopening of the Swedish investigation, WikiLeaks said it would give Assange a chance to clear his name.
"Since Julian Assange was arrested on April 11, 2019, there has been considerable political pressure on Sweden to reopen their investigation, but there has always been political pressure surrounding this case," Kristinn Hrafnsson, WikiLeaks' editor-in-chief, said in a statement.
"Its reopening will give Julian a chance to clear his name."
If convicted in Sweden, Assange could face a prison sentence of up to four years. Per Samuelson, a Swedish lawyer for Assange, said the decision to reopen the case was "embarrassing for Sweden".
"His attitude is that he is happy to co-operate with Sweden and that he wants to be interviewed and that he wants to clear his name," Mr Samuelson said.
"How that will happen now, I don't know. He has his hands full with, for him, much more important issues, namely avoiding being extradited to the US."
The British courts will have to rule on any extradition request and Home Secretary Sajid Javid would decide which one takes precedence once Swedish prosecutors file theirs.
Nick Vamos, lawyer at London-based firm Peters & Peters and the former head of extradition at Britain's Crown Prosecution Service, told Reuters before yesterday's decision that he expected that a Swedish request would take supremacy.
"In the event of a conflict between a European arrest warrant and a request for extradition from the US, UK authorities will decide on the order of priority," a statement from the Swedish prosecutor said.
