(CNN) -- A peacekeeper working for the African Union-United Nations Mission in Darfur was killed Thursday night during a carjacking, according to a statement released by the joint mission.
Unidentified gunmen shot the military observer as he was opening the gate to his home in South Darfur's capital city, Nyala. He died shortly after his arrival at a nearby medical facility.
The man's vehicle was found abandoned about 7 kilometers outside of Nyala.
"This attack is deplorable," mission Special Representative Rodolphe Adada said in the statement.
We "are here to assist the people of Darfur, and any attack on them is totally unacceptable. ... I would like to express my deepest condolences to the family of the peacekeeper who lost his life."
The African Union-United Nations Mission and the Sudanese government are now investigating the incident.
The slain observer -- whose name has not yet been released -- is the 15th peacekeeper killed in a hostile action since the mission's deployment in Sudan in early 2008.