"There was a great appreciation that accountability to donors, the affected populations, and to the citizens of the countries and to the citizens of the world, was going to be a critical objective," Eric Schwartz, the UN's deputy tsunami envoy, told AFP in an interview.
Some two thirds of the money donated in the world's largest-ever outpouring of aid has already been allocated, he said.
Watchdogs like Transparency International have warned that some of the countries worst-hit by the December 2004 tsunami are also highly vulnerable to corruption.
Hardest-hit Indonesia is regularly rated as one of the most graft-prone in the world.
British-based charity Oxfam said it has suspended some of its operations in Indonesia's tsunami-hit hit Aceh province after auditors found financial irregularities at one of its project offices.
Officials from the United Nations, the Red Cross, and from the five worst-hit countries -- India, Indonesia, Maldives, Sri Lanka and Thailand -- were meeting through F