Even as world leaders gathered today to co-ordinate billions of dollars in aid, doctors warned of a looming catastrophe from ever-more serious health woes - gangrenous wounds that require limb amputations, scores of children with diarrhea, pneumonia caused by exposure to dirty water.

Broken bones and infected wounds are the biggest health problem facing staff in overflowing hospitals in Indonesia’s shattered Aceh province, United Nations officials said today.