"UNICEF estimates a 10-fold increase in the number of children who will suffer from life-threatening malnutrition in Tigray over the next 12 months," she added.
The World Food Program (WFP) reached half of the people it planned to assist, including communities on the verge of famine in northern Ethiopia. It faces severe shortages of food, cash, fuel and functioning telecommunications equipment.
Last week, more than 175 aid trucks arrived in the Tigray region via the Abala corridor and 90 more are expected in the coming days, WFP said.
About 90 percent of Tigray's population, some 5.2 million people, require humanitarian food assistance. The UN agency and its partners require at least 100 trucks daily to meet their needs.