A White House official has declined to comment when pressed on the possible extradition of Amanda Knox to Italy.
A spokesman said: "This is a matter, as I understand it from my reading of the press, is still in a legal proceeding.
"For questions about that issue, I would refer you, as a broad principle as opposed to a matter that is still in a legal process, I would refer you to the State Department and the Department of Justice."
More top news
The CIA has been criticised for 'live-tweeting' the killing of Osama bin Laden to mark the fifth anniversary of his death.
Argos has issued an urgent recall of certain car seats and warned parents to stop using them "immediately" over safety fears.
Two bodies found in the Himalayas have been identified as Alex Lowe and David Bridges - 16 years after they went missing.