According to the UN agency, conflicts in Sudan's remote regions have killed close to 900 people this year and displaced close to 300,000.
A doctor said that ongoing skirmishes between Arab and non-Arab tribes in Sudan's unrest-plagued Darfur region have claimed at least 11 lives.
On Wednesday, violence broke out between farmers from the Daju minority and other non-Arab ethnic groups and Arab herders some 20 kilometres (12 miles) from the South Darfur state capital Nyala, according to witnesses.
What initially started the fighting, which hasn't stopped, was not immediately clear.
At least 20 individuals were treated for gunshot wounds, the doctor at Nyala hospital told AFP, adding that "the number of bodies that have arrived at the hospital has reached 11."
The death toll is "likely to be much higher as the fighting is still ongoing," according to Adam Regal, spokesman for the General Coordination for Refugees and Displaced in Darfur.
Prior to this, the official news agency SUNA reported that seven people had died and that security personnel had been dispatched to the region to stop the violence.
"A group of herders riding camels and vehicles attacked the village of Amuri on Friday, leaving the site burnt and four people killed," SUNA said, adding that two people had been killed between Wednesday and Thursday.
According to the news agency, which also cited a government statement, another person was murdered as the conflict reached surrounding villages, which were "partially burned" while businesses were pillaged.
In Darfur, a huge area that was devastated by a brutal civil war that started in 2003, ethnic confrontations frequently occur.
Rebels from ethnic minorities faced off against the government of the time, which was dominated by Arabs and led by President Omar al-Bashir.
According to the United Nations, 300,000 people were murdered and 2.5 million were displaced.
Violence still breaks out between established farmers and nomadic herders over access to scarce water and grazing pasture, despite the fact that the conflict has diminished over the years.
The debilitating effects of a military coup led by Abdel Fattah al Burhan in October of last year are still being felt in Sudan.
Earlier this month, civilian organizations and the military struck a tentative agreement to resolve the problem.