Sudan warring parties have agreed to the extension of a fragile ceasefire by five days.
Saudi Arabia and the United States, which is mediating between Sudanese forces and the rival Rapid Support Force, RSF, welcomed the agreement.
The extension would allow time for the delivery of further humanitarian aid, the restoration of essential services and further negotiations on a longer-term solution, the department added.
While the ceasefire has not been fully observed so far, some 2 million Sudanese had received humanitarian aid in recent days, it said.
The UN World Food Programme said on Monday that it had been able to start distributing food in Khartoum on Saturday and had already reached thousands of people.
Recently, there has been repeated reports of shootings, airstrikes, bombings and looting in the capital Khartoum.
The Sudanese army and RSF accuse each other of being responsible for breaking the ceasefire.
The coordinator of the UN refugee agency in Darfu disclosed that there has also been heavy fighting in the west of the country recently which humanitarian aid has not been able to reach.
Credible News reports that the army under the command of de facto President, Abdel Fattah al-Burhan is fighting the paramilitary units of his former deputy, Mohammed Hamdan Daglo.
The two generals seized power together in 2021, but later fell out.
