The four — two more French, an Italian and a Peruvian — were among those recovered in the first hours after the disaster Friday night.

Civil Protection authorities on Thursday identified them as Thomas Alberto Costilla Mendoza, a crew member from Peru, Giovanni Masia, a passenger from Italy, and French passengers Francis Servil, 71, and Jean-Pierre Micheaud, 61.

The news agency ANSA said Masia, who would have turned 86 next week, was buried in Sardenia on Thursday.

Divers combed the wreck of the ship for a sixth day Thursday in an increasingly desperate search for survivors, as salvage workers worked to prevent an environmental disaster.

The owners of the giant vessel, Genoa-based Costa Crociere, piled further pressure on the ship's captain Francesco Shettino, announcing that it would be a plaintiff in the case against him.

Marco De Luca, the company's lawyer, told Italian media that it had also officially suspended him from his duties.

The rescue operation, which was halted Wednesday after the half-submerged ship shifted while divers were still inside, resumed at first light on Thursday after tests to ensure it was safe.

Divers were to detonate explosives to make it easier to get into the 114,500-ton vessel, a coast guard spokesman said.

The large amount of fuel on board has alarmed environmentalists worried about the potential impact of a leak on this pristine nature reserve and marine sanctuary off the shores of Tuscany.

A Dutch salvage company said it is ready to pump out fuel before winds pick up later, with widespread concern among rescue teams that choppy seas could again force a suspension of operations.

Salvage workers say there is currently no danger of large-scale pollution off Italy's scenic Giglio Island but admit there is still a risk, particularly as the pumping operation is expected to take around four weeks.

Rescuers have so far recovered 11 bodies from the disaster and 21 more people are missing out of the more than 4,200 who had been on board the Costa Concordia when it hit rocks off the island of Giglio on Friday.

Kevin Rebello from Mumbai, whose brother Russel worked as a waiter on the ship and is one of the missing, told AFP: "My brother stayed to help others ... It should have been the captain who left the ship last."

"The fact (that the captain) left early is something I just cannot get over. I'm very angry," said Rebello, who has traveled to the tiny island to see the rescue operations on the 17-deck ship for himself. "If it had happened in another country, he would not be home now sipping coffee with his mum, he would be in prison. It's not Disneyland," he said.