The death toll in Indonesia's quake-tsunami disaster nearly doubled to more than 800 Sunday, as ill-equipped rescuers struggled to reach scores of trapped victims, health officials resorted to mass burials and desperate residents looted shops for food and water.

"The casualties will keep increasing," said national disaster agency spokesman Sutopo Purwo Nugroho, whose agency announced 832 deaths, adding, "Today [Sunday] we will start the mass burial of victims, to avoid the spread of disease." Indonesian Vice-President Jusuf Kalla said the final death toll in the north of Sulawesi island could be in the "thousands" since many regions have still not been reached.