The Central African Republic's government says 60 people have been killed in clashes between fighters loyal to ousted president Francois Bozize and the rebels who now hold power.
A government spokesman, Guy Simplice Kodegue, said the fighting took place Saturday and Sunday around the northwestern town of Bossangoa, in Bozize's home region.
Among the dead were two aid workers and at least five members of the Seleka coalition of rebels who ended Bozize's 10-year-rule in March.
The fighting caused civilians in the area to flee into the nearby forests.
U.N. officials have warned of increasing violence and unrest in the CAR. Last week, the U.N. refugee agency said at least eight villages in the center of the country had been burned to the ground.
The agency says more than 62,000 people have fled the country since September.
The Central African Republic has endured a long series of coups and rebellions since gaining independence from France in 1960.