Military officials in the Democratic Republic of Congo say rebel fighters have attacked an army camp in the eastern Ituri region.
There were few details about Saturday night's raid, but army officials said at least two militia fighters were killed in gunbattles.
Rebel groups regularly clash with military forces in the DRC. The United Nations says the violence has caused some 170,000 Congolese to flee their homes in recent months.
Some 17,000 U.N. peacekeepers are stationed in Congo to secure the country for nationwide elections July 30.
On Friday, the head of the notorious Mai Mai militia surrendered to U.N. forces and pledged to disarm his troops. Officials said it was a major victory for stabilizing the country. Some information for this report was provided by AFP and AP.