Millions of people who have fled devastating conflict in Sudan face being left without shelter, the United Nations warned Friday.

After more than three years of civil war, the UN estimates that 15.4 million people need emergency shelter and essential household items. But UN agencies said they had only been able to target 10% of those in need because of funding shortages. And out of those, “we could reach only 900,000 people,” said Mohamed Refaat, the International Organization for Migration’s (IOM) chief of mission in Sudan.