Residents in the town of El Sireaf said, heavy machine gun fire and rocket-propelled grenades Arab militias burned houses and killed more than 50 people on Saturday.
"We are very concerned over the violence," said Damian Rance from the Office of the coordination of Humanitarian Affairs of the United Nations (OCHA) told AFP.
"The violence that has affected our ability to run humanitarian operations," he added.
Approximately 100,000 displaced persons or very affected by fighting in Darfur since the beginning of January between the Rezeigat tribe and Arab rival of Beni Hussein in gold mining area of Jebel Amir of the State of North Darfur.
Residents still displaced across a vast area but the majority of them arrived in the town of El Sireaf, where the battle occurred on Saturday.
Aid convoys are still moving in the surrounding area but "we do not have access to the city of El Sireaf" because of the fighting, Rance said.
The clash-the clash between Sudanese troops and the guerrillas continued in Darfur despite the world's biggest peacekeeping mission COMPUTERS, placed in the region of Western Sudan.
The African Union-UN Mission in Darfur (COMPUTERS), which now numbered 23,500 people and is the largest peacekeeping mission in the world, was stationed in Darfur, Western Sudan, since 2007 to try to end the hostilities between the rebels and the Government of the Sudan.
The UNITED NATIONS said more than 300,000 people killed since the conflict erupted in the region of Darfur in 2003, when ethnic minority rebels took up arms against the Arab-dominated Government to demand greater sharing of resources and power. Khartoum Government called the number of deaths is only 10,000.
The Sudanese Government signed a peace treaty with Qatar sponsoran an Alliance of rebel groups in 2011, but large groups rejected it.
The main guerrilla groups the justice and Equality Movement (JEM) rejected the Treaty, signed by Sudan and the justice and Freedom Movement (LJM), the other rebel group in Darfur.
JEM is one of several Darfur rebel groups in 2003 to demand wider autonomy for the arid Western region. They are now regarded as the most powerful rebel group in Darfur.
The split among the rebels and a battle that lasted into two main obstacles to the peace negotiations which took place since 2003 in Chad, Nigeria and Libya, before moving to Doha.
The International Criminal Court (ICC) based in the Hague issued an arrest warrant against Sudanese President Omar al-Bashir on 2009 on charges of war crimes and crimes of humanity in Darfur, Western Sudan. Bashir is also accused of committing genocide in the warrant of arrest.
Bashir has denied accusations the Hague Court and referred to it as part of a Western conspiracy to remove him. The arrest warrant is the first issued by the International Court against a head of State. (M014)
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