BRINDISI, Italy — Stormy weather in the Adriatic Sea thwarted efforts Wednesday to tow a fire-ravaged ferry to Italy so authorities can investigate the blaze that killed at least 11 people and search the ship for more possible dead.

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 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 in the sea. Hundreds were rescued in the maritime disaster, but the exact number of ferry survivors and how many were onboard to begin with are still not known.

Volpe said he hoped that Greek authorities would be able to say many people had been rescued by various ships and brought to Greece. Greece’s coast guard later said nine Greeks were still missing but did not resolve other questions.

Greece’s merchant marine ministry said Italy is not giving the ministry lists of who has been rescued and mishandling the process of identifying the rescued and missing.

“We maintain reservations as to the precise number of rescued people that we can make public, as the information forwarded to us so far by Italian authorities contains names listed twice and misspellings in the names registered,” the ministry said in a statement.

Volpe 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.”

He said until the wreck was examined, he couldn’t venture a possible cause for the blaze.

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 under way, Volpe would not give any details about the questioning.

Nearly 40 survivors stepped ashore Wednesday in the Italian port of Taranto, brought by one of the cargo ships that rescued them from the flaming, smoke-shrouded ferry in the first hours of the disaster.