Successive failed rains have created a series of severe back-to-back droughts in Ethiopia and the Horn of Africa region.
According to figures compiled by the government and its humanitarian partners, the number of people now critically short of food is expected to rise by at least two million by July.
Humanitarian groups fear donor fatigue is weighing on efforts to meet requirements.
The United Nations says famine in northeast Nigeria, South Sudan, Yemen and Somalia, constitute the worst humanitarian crisis the world has faced since 1945.
