The number of internally displaced persons (IDPs) in Sudan's western region of Darfur has risen to one million, the United Nations said on Tuesday. In a report issued in New York, the UN's Office for the Coordination of Humanitarian Affairs (OCHA) warned that the situation in Darfur was compounded by shortfalls of shelter, clean water, food and health-care supplies. It warned that "all funds contributed for relief efforts in Darfur so far have already been exhausted", noting that the UN expected to revise its humanitarian appeal for the region beyond the US $115 million requested earlier this month.