New Delhi, Aug. 23 -- A drone attack on a U.N. convoy set fire to all 16 trucks carrying desperately needed food to Sudan's famine-hit North Darfur region and destroyed all the vehicles, the United Nations said Thursday.

U.N. associate spokesperson Daniela Gross told reporters that all drivers and personnel traveling with the World Food Program convoy are safe.

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.

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