New evidence is emerging of alleged ethnic killings committed during more than a week of fighting in South Sudan.
According to a BBC report, the violence follows a power struggle between President Salva Kiir, a Dinka, and his Nuer ex-deputy Riek Machar.
A reporter in the capital, Juba, quoted witnesses as saying more than 200 people, mostly from the Nuer ethnic group, were shot by security forces.
Another man in Juba said gunmen from the majority Dinka ethnic group were shooting people in Nuer areas.
The fighting first erupted in Juba last week and has spread throughout South Sudan, with rebels supporting Mr Machar seizing the major towns of Bor and Bentiu, north of the capital.
Mr Kiir has accused Mr Machar, who he sacked in July, of mounting a coup. Mr Machar denies he is trying to seize power, while the government has denied it is behind any ethnic violence.
The fear is that the personal rivalry between the former allies will spark a full-scale conflict between the Nuer and Dinka groups.