BERLIN — The United Nations has revised the number of bodies it says were found in a mass grave in South Sudan.

The U.N. now says staff counted 34 bodies at the site and have received reports that about 75 people are “unaccounted for and feared dead.”

U.N.’s human rights chief says the mass grave was found in Bentiu in the country’s oil rich Unity State.

Navi Pillay said in a statement released Tuesday that at least two other mass graves are reported to have been found in Juba.

A spokeswoman for the Geneva-based human rights office says the bodies in Bentiu reportedly belonged to ethnic Dinka who were members of the Sudan People’s Liberation Army.

Ravina Shamdasani told The Associated Press that the global body has staff in the country investigating the incidents.

She says it is unclear who was responsible for the killings.

Shamdasani says the other two reported mass graves are in Jebel-Kujur and Newside, near Eden.