UN peacekeepers in the Democratic Republic of Congo have shot dead a Congolese soldier during a search for an arms cache.
The UN has more than 10,000 peacekeepers in DR Congo
Reports say the incident took place on Monday night in the north-eastern city of Kisangani.
The arms were said to be stored at the home of a senior Congolese officer.
The UN mission is overseeing a peace accord in DR Congo which ended a five-year civil war and set up a transitional power-sharing government.
Congolese troops are supposed eventually to be disarmed and demobilised throughout the country, with some being re-absorbed into a national army together with fighters from various rebel factions.
A UN spokesman in the capital Kinshasa who described the incident told the Associated Press said the Congolese commander had harsh words with the peacekeepers and pushed one of them.
Congolese soldiers fired on the UN troops first, as they withdrew from the officer's house in an effort to avoid an incident, Hamadoun Toure said.
He added that the peacekeepers - none of whom was hurt - were now meeting local troops in the city to defuse tensions.
No arrests were made and it is not clear what the arms cache was allegedly being used for.
Last week, a South African UN peacekeepers was shot dead in the volatile South Kivu province.