Divers found a woman's body in the Costa Concordia cruise wreck off the coast of Italy on Sunday, Jan 22, raising the death toll to 13, as families of the missing attended a remembrance mass, AFP reported.

"Divers from the fire services found the body of a woman at deck seven at the stern of the ship, in the area underwater. She was wearing a life-jacket," spokeswoman Francesca Maffini from the Civil Protection Agency said.

Divers had carried out a search in previously inaccessible parts of the ship below the water line, after the rescue mission was called off temporarily overnight because the perilously beached vessel had shifted in the water.

The head of Italy's protection agency, Franco Gabrielli, had said earlier on Sunday that divers were looking for 20 people officially missing, but said that there may have been people on board who were not on crew or passengers lists.