Search teams have reportedly located eight more bodies in the wreck of the cruise liner that capsized off Italy's western coast last month.
The discovery of four victims was reported initially.
Officials said the bodies were being transferred to a hospital for identification, a process that could take days.
The "Costa Concordia" was carrying more than 4,000 passengers and crew when it struck rocks off Tuscany on January 13.
Before the February 22 announcement, 17 people had been certified dead from the disaster and a further 15 people remained missing.
Italian prosecutors have placed the ship's captain, Francesco Schettino, and First Officer Ciro Ambrosio under investigation for the incident.
Salvage workers have been pumping fuel oil from the ship's tanks to avoid an environmental disaster.
Dozens of survivors have launched lawsuits in France, Germany, and the United States against the company that owns the cruise ship, Carnival.
With AFP and dpa reporting