Ninety-eight people were still unaccounted for Wednesday after a pre-dawn fire raced through the Norman Atlantic ferry on Sunday, Bari prosecutor Giuseppe Volpe was quoted as saying by the ANSA news agency.
It's not clear if those people ever boarded the ferry which left Greece on Saturday bound for Italy if they were rescued, or if they died in the fire or the sea. Hundreds were rescued but the exact number of ferry survivors is still not known.
He also told Sky TG24 TV it was important to have the ferry towed to Italy "to see if there are bodies aboard...To ascertain what caused the fire and to see if safety measures were respected."
Volpe said until the wreck was examined, he couldn't venture a possible cause for the blaze.
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The Italian captain of the Italian-made ferry, which was operated by a Greek company, was questioned in the southern port of Bari by prosecutors for more than five hours Wednesday. Since a probe is underway, Volpe would not give any details about the questioning.
The blaze on the ferry's car deck sent people scrambling for their lives in the freezing cold, pelted by rain and buffeted by gale-force winds on the uncovered top deck.
Amateur video made by two Turkish passengers who spent two days aboard the ferry showed clouds of black smoke belched up by the fire and bursts of flame as survivors lined up to be rescued by helicopters.
Snow fell today in usually temperate southern Italy, and winds whipping up to 70 kph (45 mph) made for rough seas as tugboat crew tried to secure the wreck.
"The shipwreck that we are towing is not anchored, and so it tends to move," said Giusieppe Barretta, owner of the tug company. He estimated once the ferry is secured, the tow to Italy could take up to 12 hours.