Anxious relatives are holding on to faint hopes rescue workers will find more survivors from a cruise ship that ran aground off the northwest Italian coast.

Officials suspended their search of the Costa Concordia Wednesday after the cruise ship started shifting on the rocks that tore a hole in the hull, causing it to tip over.

Officials say at least 11 people were killed and 20 are still missing as a result of Friday's accident.

Divers have described difficult conditions inside the submerged ship, and Italian officials say additional searches will be impacted by changing weather conditions. The weather is also sparking concern about a possible environmental disaster.

Italian Environment Minister Corrado Clini said Wednesday the damages could be terrible if some of the estimated 2,400 tonnes of fuel starts to leak. He said efforts to start pumping out the fuel could start once the search for survivors ends, provided weather conditions are stable.

Meanwhile, Italian prosecutors say they want the captain of the Costa Concordia back in jail.

Francesco Schettino is under house arrest, facing charges for manslaughter and abandoning ship before all the passengers were rescued. But prosecutor Francesco Verusio said Wednesday officials wanted to “avoid the situation where Schettino could escape from his responsibilities.”

Schettino's lawyer defended the captain during a news conference Wednesday, saying his client “never left the scene.” Bruno Leporatti also said contrary to stories in the Italian media, Schettino was “deeply shaken” by the accident.

Relatives of the missing have been gathering in Porto Santo Stefano hoping to hear their loved ones have been found, but many are growing impatient.

Madeleine Soria Molina's sister was a crew member on the Costa Concordia. She told reporters, “I'm here to find my sister. I should do everything to find her.” She also said time was running out.

A relative of another missing crew member said he is confident the ship's captain will face justice, but that the charges are of little concern to him. Kevin Rebello says the main priority for the families is “to look for their family members and to find them and see that they take them home safely.”

An audio recording released Tuesday of an angry exchange between the Italian Coast Guard and the captain of the capsized ship reveals that the captain refused orders to get back on his stricken boat.

Coast Guard Captain Gregory De Falco demanded that Captain Schettino use a ladder to climb back onto the damaged Costa Concordia and report how many people were still on board.

But Schettino responded that he was not going anywhere, complaining that it was too dark on the boat. He said he was coordinating the rescue from a lifeboat. A furious Captain De Falco bellowed that he was now in charge and he ordered Schettino back on the boat — warning him that he was “going to pay” for his actions.

The owners say he steered too close to shore and made decisions during the emergency that did not follow company procedures, which they said are based on international standards.

During a news conference with British Prime Minister David Cameron Wednesday, Italian Prime Minister Mario Monti said, “any such disaster could and should be avoided.”

Officials say that when the ship hit the rocks, passengers were ordered to put on life jackets and to board life rafts. However, passengers say the ship tilted so sharply and quickly that many lifeboats could not be lowered into the water.

The $450 million Costa Concordia cruise ship was carrying more than 4,200 passengers when it ran aground.