Amanda Knox has said the decision by judges to reinstate her murder conviction for the death of British student Meredith Kercher "hit me like a train".
Knox, who stayed in her native US for the trial, vowed to "never go willingly" back to Italy, where she was sentenced to 28 years and six months and her former boyfriend Raffaele Sollecito was jailed for 25 years.
She told American television network ABC's Good Morning America: " It hit me like a train. I didn't expect this to happen. They found me innocent before. How could they?"
She added: "I'm going to fight this to the very end."
Sollecito was held by police near Italy's border with Slovenia and Austria at around 1am today.
He was found by officers with his current girlfriend at a hotel in Venzone, about 24 miles from the border, and was taken to a police station in Udine. He is expected to be freed later with a stamp in his passport forbidding him from leaving the country.