U.N. spokesman Martin Nesirky said late Tuesday that the convoy was attacked by unidentified assailants in South Kivu. No other details were immediately available.
Secretary-General Ban Ki-moon said the attack killed a Pakistani peacekeeper and condemned it "in the strongest terms," Nesirky said.
The secretary-general called on the Congolese government to bring the perpetrators to justice and reiterated that the killing of U.N. peacekeepers is a war crime that can be prosecuted by the International Criminal Court, Nesirky said.
The U.N. peacekeeping mission has launched an investigation into the attack, he said.