Rebels in Sudan's Darfur region say they clashed with government forces Wednesday, days before a scheduled new round of peace talks.
The Sudan Liberation Army faction of Abdel Wahid Nur said its troops attacked the government-held Golo district in the Jebel Marra mountains.
A spokesman said there were casualties on both sides. He did not give specific figures.
The joint U.N.-African Union peacekeeping mission confirmed there was fighting in the area.
The rebels say earlier this week, Sudanese warplanes bombarded rebel-controlled areas in Jebel Marra and in Jebel Moun, near the border with Chad.
Peace talks between Khartoum and Darfur rebel groups are due to resume later this month in Qatar.
The United Nations says the fighting in Darfur has killed up to 300,000 people and displaced 2.7 million since 2003.
The government says 10,000 people have died in the conflict.
Some information for this report was provided by AP, AFP and Reuters.