15 wounded in Darfur fighting

The U.N. says at least 15 people have been wounded in an armed clash in the troubled Darfur region.

A U.N. statement Sunday said it was not known how many people were killed in the clash between "unknown armed men and the Sudanese Armed Forces." It said 15 wounded were evacuated by helicopter from the fighting in north Darfur state near Shangil Tobaya.

Sudan's government had no immediate comment.

The U.N. said about 1,000 civilians fled the scene of the battle, and all but 40 returned to their homes afterward.

The background of the clash was not immediately clear. Clashes between Sudanese government forces and rebels erupt frequently in Darfur, the scene of mass killings and attacks that forced hundreds of thousands to flee in past years,