The death toll from flash floods and mudslides in Rio de Janeiro's picturesque Serrana region reached 702, a number that is likely to rise further in one of Brazil's worst natural disasters on record. Authorities say many residents in the region are still missing, some believed to be buried.Hundreds of people are still in areas at risk of fresh mudslides, some cut-off from help by washed-out roads and bridges; while others refuse to leave for fear their houses will be looted. The death toll is still rising daily as rescuers dig out more bodies from the ruins.Army helicopters have been carrying out rescue and supply operations to attend to residents cut-off from help for nearly a week since rains unleashed a sudden spate of hillside mud, trees and boulders on the tourist towns below, sweeping away or burying neighbourhoods.