The World Food Programme (WFP) temporarily halts humanitarian work in Sudan after three staff were killed in the clash between the government and rivals.
Cindy McCain, executive director of the UN's World Food Programme, says she is "appalled and heartbroken" by the killing of three employees in Sudan's Darfur region.
The deaths happened during violence in Kabkabiya in North Darfur and two other workers were injured, reports BBC.
WFP also says one of its planes was damaged at Khartoum airport.
Fighting has entered a second day as a power struggle between Sudan's army and paramilitaries rages in Khartoum and elsewhere.
The RSF says it controls key sites in the capital but Sudan's leader - and head of the military - has rejected its claim.
The African Union, leading Arab states and the US have called for an end to the fighting and a resumption of talks aimed at restoring a civilian government.
Sudanese groups and the ruling military junta failed to reach an agreement last week on a handover of power.
Bd-pratidin English/Golam Rosul
