Sabrina De Sousa was arrested at Lisbon Airport on Monday, and released yesterday after authorities seized her passport, prosecutor Armando Spataro told The Associated Press.
"She is awaiting a decision on whether she will be brought to Italy," Spataro said. It was not clear if she was arriving or departing when she was arrested.
Even after the convictions, Italy never made a formal extradition request for the Americans in the politically charged case.
In the absence of an extradition request, Spataro said it is likely that De Sousa was picked up on a European arrest warrant that was issued via law-enforcement channels after her conviction.
Portuguese authorities said the only person authorized to discuss the case was the judge handling it but he did not immediately respond to telephone messages seeking comment.
The Italian Justice Ministry did not immediately return calls seeking comment on De Sousa's detention.
De Sousa, an ex-CIA operative who operated under diplomatic cover, was initially acquitted due to diplomatic immunity, but was found guilty by Italy's highest court in 2014.
De Sousa came out publicly against the US decision not to allow the American defendants to get their own lawyers near the end of the first trial, eventually winning permission to have her own counsel.
De Sousa said she was concerned about losing her freedom to travel to visit family in India.
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