"The U.N. helicopter was in the vicinity at the time of the bombing, and it took off and landed without damage, " said Josephine Guerrero, a spokeswoman for the mission.

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He said the SPLA had contacted the U.N. mission after seeing the helicopter near an SPLA command post but had been told it had no aircraft in the area.

CNN: Russia urges South Sudan to act over downed U.N. helicopter

The U.N. is transporting therapeutic milk by helicopter to Kanya and Kanyabayonga to feed hundreds of malnourished children.

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Secretary-General Ban Ki-Moon condemned the shooting down of the helicopter, saying in a statement that it was clearly marked as being a U.N. aircraft.

CNN: Russia urges South Sudan to act over downed U.N. helicopter