Raffaele Sollecito was stopped between Udine and Tarvisio, near the Slovenia and Austria borders, Italy’s Rai News said.
He was given 25 years and American ex-girlfriend Amanda Knox 28 years and six months in Thursday’s ruling.
The Kercher family lawyer said that justice had been done.
A travel ban was part of the verdict handed down on Raffaele Sollecito.
He had been in court earlier in the day on Thursday but was not there for the ruling.
Raffaele Sollecito’s lawyer, Luca Maori, said his client had heard the verdict on TV and looked “annihilated”.
Lawyers for both Amanda Knox and Raffaele Sollecito have said they will appeal to the supreme Court of Cassation.
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