NAIROBI, Kenya (AP) — A United Nations-backed gathering raised pledges of almost $630 million for Ethiopia’s humanitarian crisis on Tuesday but fell short of the $1 billion sought to help feed and support millions of people facing conflict and climate change in Africa’s second most populous country.

The United States, Ethiopia’s leading humanitarian donor, warned that its resources are “increasingly stretched.” The U.K., the second-largest donor, said Ethiopia risks being ”overshadowed by other humanitarian crises globally.”

Donors also called on the Ethiopian government to ensure aid is delivered without interference and reaches those in need. Last year, the U.S Agency for International Development for months suspended all food aid to Ethiopia after an internal investigation found donated food intended for millions of hungry people was being diverted on a “widespread” scale.