In the custody dispute over six-year-old Eitan, who was the only one who survived the cable car accident on Whitsunday on Lake Maggiore, the public prosecutor's office in Pavia issued an international arrest warrant against his grandfather Shmuel P. and an accomplice.
In addition, Israel and Cyprus applied for the two men to be extradited.
The investigators accuse the two men of having "strategically planned" the transfer of the boy to Israel against a court order.
Matthias Rüb
Political correspondent for Italy, the Vatican, Albania and Malta based in Rome.
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An Italian family judge had decided that the orphan boy should stay with his aunt on his father's side near Pavia.
In the disaster of May 23, Eitan lost his parents, great-grandparents and younger brother as well.
Via Switzerland to Israel
According to Italian media reports, the grandfather's accomplice is an employee of the American security company Blackwater.
The 50-year-old man brought Eitan and his grandfather by car from Italy to Lugano in Switzerland in September, from where the two then traveled to Tel Aviv in a chartered small plane.
According to media reports, the flight cost the equivalent of 42,000 euros.
A court in Tel Aviv ordered the boy's return to Pavia at the request of Aunt Eitan's.
Eitan's grandfather and other family members on his mother's side have appealed against the judge's ruling.