Rebels in Sudan's Darfur region say dozens of people have been killed in attacks by the Sudanese army.
A faction of the rebel Sudan Liberation Army says troops attacked the rebel-controlled Tabra district on Thursday and that fighting continued into Friday morning.
Spokesman Ibrahim al-Helwu says more than 50 people were killed and more than 150 others wounded. Al-Helwu represents the SLA faction loyal to Abdelwahid Nur.
The French news agency quotes a Sudanese army spokesman as saying the SLA claims are "completely baseless," and that there have been no clashes between the army and the rebels.
The United Nations-African Union mission in Darfur said it received reports that armed men on camels and horses rode into a Tabra market on Thursday and began firing randomly.
A spokesman said peacekeepers are trying to reach the area.
Darfur has endured more than seven years of violence since rebels rose up against Sudan's government, accusing it of neglecting the region.
The United Nations says more than 300,000 people have been killed and 2.7 million displaced from their homes. Sudan puts the death toll much lower, at 10,000.
The International Criminal Court has indicted Sudanese President Omar al-Bashir for alleged war crimes in the region.
Some information for this report was provided by AFP and Reuters.