A assistance agency told the BBC that Sudanese people were eating leaves and charcoal to survive after escaping the camps of displaced people near the city of El-Fasher.
“The stories we hear are really scary,” Noah Taylor, operations director for the Norwegian Refugee Commission, told the BBC's News Day plan.
Mr Taylor added that people were fleeing to El-Fasher in Tawila but “all died when they arrived.”
He said some people “desire to die from desire” while a 40km (25mile) journey from Zamzam camp was carried out to “foam” temperatures.
“We have heard the story, there are still bodies on the road between El-Fasher and Tawila.
“We talked to a family who told us that a girl walked alone from El-Fasher, raped repeatedly during the journey, and then died from her wound when she arrived at Tawila.”
El-Fasher is the last city in western Darfur in western Sudan, under the control of the army and its allies. Earlier this month, the Paramilitary Rapid Support Force (RSF) attacked nearby Zamzam camp, forcing thousands of people to escape from temporary shelters.
Many Zazam residents stayed there for twenty years after the previous conflict in Darfur.
The RSF has been fighting the military for the past two years, a war that killed an estimated 150,000 people and forced about 13 million people from their homes.
Aid agencies say this is the worst humanitarian crisis in the world.
However, funding issues have led to the United Nations reducing its food aid to cause famine-hitted Sudan areas.
During the fight, the RSF was accused of targeting non-Arab residents in Darfur.
British Foreign Minister David Lammy said on Thursday that this indicated “a sign of ethnic cleansing that could constitute a crime against humanity.”
He urged both sides to “provide the security assurances needed to provide prompt assistance to humanitarian actors”.
At least 481 people have been killed in North Darfur since April 10, and the United Nations said on Friday that the total could be higher.
Volker Türk, the agency’s human rights chief, expressed concern about the situation: “The system that assists victims in many areas is on the verge of collapse, medical personnel themselves are threatened and even water sources are intentional attacks.”
He also expressed concern about “wide reporting of sexual violence.”
Nathaniel Raymond, director of the Humanitarian Research Laboratory at Yale School of Public Health, said the Zamzam camp had been burned.
Mr Raymond described “system destruction through the fire of houses” and “aid facilities”, adding that people who managed to escape Zamzam were “deathing from hunger.”
Mr Taylor also warned that Tawila was struggling to deal with the influx of people fleeing her homeland.
“There are few ways to eat and very few ways to water,” he said, adding that the town is currently sheltering between 130,000 and 150,000 people.
Last week, people fleeing Zamzam told the BBC that their homes were burned and they were shot. RSF said it attacked the camp but denied any atrocities.
The battle continued elsewhere in Sudan.
In the western Kodofin province, southern Kodofin, 74 people were killed when the RSF attacked the village of Al-Za'afah, the Sudanese doctors network said Friday.
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