More than 60,000 people have fled the Sudanese city of el-Fasher, which was captured by the paramilitary Rapid Support Forces (RSF) over the weekend, according to the UN refugee agency.
There have been reports of mass executions and crimes against humanity as the RSF fighters stormed the city after an 18-month siege marked by starvation and heavy bombardment.
The flow of those fleeing the violence towards the town of Tawila, about 80km (50 miles) west of el-Fasher, has increased in the past few days, the UNHCR's Eujin Byun told the BBC.
They were narrating horrendous stories of atrocities, including rape, and the agency is struggling to find enough shelter and food for them.
Every child was suffering from malnutrition, she added.
It is estimated that more than 150,000 people are still trapped in el-Fasher, which had been the army's last stronghold in the western region of Darfur.
The RSF has denied widespread allegations that the killings in el-Fasher are ethnically motivated.
But the RSF has detained one of its militiamen, Abu Lulu, who has been accused of summary executions.
This violence has been part of an ongoing civil war that erupted in April 2023, leading to a humanitarian crisis with over 150,000 deaths and millions displaced.
The takeover of el-Fasher underscores the geographic split in the country between RSF-controlled regions and those held by the army.
