UN leader Ban Ki-moon said he "strongly condemns" the killings, but called for efforts to prevent an escalation between the rival countries.
A UN peacekeeping convoy was stopped and attacked by Arab Miseriya tribesmen in Abyei on yesterday, UN officials said. Kual Deng Majok, paramount leader of the rival Ngok Dinka tribe, was in the convoy and was killed.
Ban said in a statement that two peacekeepers from the UN Interim Security Force in Abyei (UNISFA) were seriously wounded.
"The secretary general strongly condemns the killing of the Ngok Dinka paramount chief" and the UNISFA peacekeeper "in an attack by a Misseriya assailant on a UNISFA convoy," said a statement released by the UN.
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He expressed "deepest condolences" to the Ngok Dinka tribe and the Ethiopian government.
Ban "urges the governments of Sudan and South Sudan and the Ngok Dinka and Misseriya communities to remain calm and avoid any escalation of this unfortunate event," the statement added.