United Nations officials in Sudan say they urgently need new funds to help avert a humanitarian catastrophe after crop failures caused by a severe drought.They say nearly one million people could be at risk of starvation if food aid doesn't reach them over the next three months. In some areas of Sudan, UN officials say, wells have now begun to run dry, and people have started to move in search of food. The UN has been warning of the effects of the drought for several weeks, but now officials say their latest crop assessments indicate the situation is even worse than they had predicted. The UN says it will now need an extra 40 million dollar in food aid and 7 million dollar for water, healthcare, and education for children who will be displaced because of the drought. This is in addition to the 194 million dollar to pay for relief aid it asked for in November.