WIKILEAKS founder Julian Assange faces interrogation for up to a fortnight while Swedish prosecutors decide if there is enough evidence to charge him with sex offences, a senior diplomat said yesterday.

Mr Assange, who on Wednesday lost his fight in the British Supreme Court against extradition to Sweden, has 14 days to appeal against the decision.

The alleged offences involve one count of "minor rape" of one woman and "sexually molesting and coercing" another arising from incidents in Stockholm in August 2010.

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Mr Assange claims the charges are politically motivated and are likely to result in a second extradition action by the US, based on an espionage indictment being prepared against him there.

US ambassador Jeffrey Bleich dismissed Mr Assange's claims of a "secret warrant" on Wednesday. "There's absolutely no basis for the US to be interested in this. We're not involved," he said.

This was supported yesterday by Swedish ambassador Anders Sven-Olof Petersson, who told The Australian that Washington had shown no interest in pressing for Mr Assange's extradition to Sweden.

However, the Gillard government had raised concerns with Stockholm about an Assange trial, he confirmed.

Under Swedish law, if Mr Assange's extradition goes ahead, the first phase will be an interrogation -- a closed hearing in which the 40-year-old would be accompanied by a lawyer.

Swedish prosecutors are keen to have the matter heard as soon as possible, and Mr Assange will be freed if the prosecutor rules there is insufficient evidence to proceed, Mr Petersson said.

"He will be taken into custody and then he will be interrogated by the prosecutor, and the prosecutor will decide whether she will again interrogate the girls (the two complainants)," he said.

"When this is done, she will decide whether there is enough to go to court or not. But if she decides there is not enough for a court case, he will be released and go wherever he wishes -- back to Australia to become a senator maybe."

Given the length of time spent on extradition proceedings, the legal process was likely to be speeded up, and even if the case went to trial it could be finalised within a month, he said.

Speaking in question time yesterday, Julia Gillard said regardless of the outcome of Mr Assange's appeal, he would continue to be provided with full consular assistance.

Mr Assange's mother Christine renewed her criticism of the federal government.

"Absolutely useless," she told ABC radio. "They've done everything they can to smear Julian and hand him up to the US."

But Foreign Minister Bob Carr said he was proud of the help the government had given Mr Assange since his arrest.

"There's been no Australian who has received more consular support in a comparable period than Mr Assange," he said.

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