A Swedish prosecutor raised the possibility that Julian Assange, the founder of WikiLeaks, could eventually be extradited to the United States in a statement posted online on Tuesday.

Marianne Ny, the Swedish prosecutor who asked British authorities to detain Mr. Assange and send him to Sweden for questioning about possible sex crimes, discussed the possibility of sending him to the United States in a statement posted on the Swedish Prosecution Authority’s Web site on Tuesday.

Perhaps prompted by speculation that Mr. Assange might be indicted by a grand jury meeting in secret in the United States to consider charges against him related to the publication of leaked American military and diplomatic documents, one section of the Swedish prosecutor’s statement, under the heading, “Facts About Extradition of a Person Who Has Been Surrendered,” reads:

Due to general agreements in the European Arrest Warrant Act, Sweden cannot extradite a person who has been surrendered to Sweden from another country without certain considerations. Concerning surrender to another country within the European Union, the Act states that the executing country under certain circumstances must approve a further surrender. On the other hand, if the extradition concerns a country outside the European Union the authorities in the executing country (the country that surrendered the person) must consent such extradition. Sweden cannot, without such consent extradite a person, for example to the U.S.A.

In other words, the prosecutor said that Britain would have to agree to allow Sweden to send Mr. Assange to the United States even if he ends up in Swedish custody.

In an interview with Al Jazeera in London on Saturday (embedded above), one of Mr. Assange’s lawyers, Mark Stephens, told David Frost that he feared his client was being set up for extradition from Sweden to the United States.

We have heard from Swedish authorities that there has been a secretly-empaneled grand jury in Alexandria — which some people, you’ll certainly know, is just over the river from Washington, D.C., next to the Pentagon — and they are currently investigating this. And indeed the Swedes, we understand, have said that if he comes to Sweden, they will defer their interest in him to to the Americans. Now, that shows some level of collusion, and embarrassment. So it does seem to me that what we have here is nothing more than a holding charge, with the Americans. It won’t really matter to them whether he’s held in Sweden or here, so that ultimately they can get their mitts on him.

On Tuesday, another lawyer from Mr. Stepehens’ law firm, Jennifer Robinson, told Justin Elliott of Salon that the existence of a grand jury was still “purely speculation.” She added, We do not have any concrete information about that.”

If such a grand jury does exist, American federal prosecutors might prefer to try to extradite Mr. Assange from Sweden to face arcane charges related to computer crimes because they have already spent years fighting to get British authorities to surrender another such person — a Scottish computer hacker named Gary McKinnon.

As my colleague John Burns explained last year, Mr. McKinnon acknowledged hacking into 97 computers belonging to the United States Defense Department, Navy, Army and Air Force, and NASA, in 2002, searching, he said, for information about U.F.O.s. But, even though a grand jury in Virginia indicted him in 2002, the long legal battle to extradite Mr. McKinnon is still going on, eight years later.

While Mr. Assange is not British, as is Mr. McKinnon — and he has not been implicated in hacking into American government computers — he is, as an Australian, a citizen of a Commonwealth country with close cultural ties to Britain. For that reason, if American officials are hoping to extradite Mr. Assange in less than eight years, they might just be rooting for him to end up in Swedish custody.