UNITED NATIONS (AP) — A drone attack on a 16-truck U.N. convoy carrying desperately needed food to Sudan’s famine-hit North Darfur region destroyed three vehicles that had caught fire, the World Food Program said. All drivers and personnel were safe.

“Our drivers survived, but 3 trucks carrying life-saving aid were DESTROYED. Attacks must stop. Safe, sustained access must be guaranteed,” said Cindy McCain, chief of the U.N. food agency, said in a post on X.

U.N. associate spokesperson Daniela Gross had initially told reporters Thursday that all 16 trucks were set on fire and destroyed. Gross said it was not yet clear who was responsibility for Wednesday’s attack, the second in the past three months to prevent a U.N. convoy from delivering to North Dafur. In early June, a convoy from the World Food Program and UNICEF was attacked while awaiting clearance to proceed to North Darfur’s besieged capital, el-Fasher, killing five people and injuring several others.