A Sudanese Dinka tribeswoman stands outside her hut as a storm gathers in the village of Mvolo in South Sudan's Western Equatorial State April 2010.

A Sudanese woman with ethnic Nuer tribal scarification stands outside her grass hut in the town of Malakal in South Sudan's Upper Nile state April 2010.

A man has his head shaved in an open field in the town of Nasir in southeastern Sudan June 2009. Ethnic clashes threaten a fragile peace in Southern Sudan.

A Sudanese woman examines two of the twelve ballot papers cast by voters at a polling station in the town of Malakal in Upper Nile state, April 11 2010.

A blind Nuer woman recovers at a health clinic run by the medical charity Medecins Sans Frontieres (Doctors Without Borders) after being shot in the arm last weekend during fighting in the town of Nasir in southeastern Sudan, June 2009. Ethnic clashes threaten a fragile peace in Southern Sudan.

Nyachiew Gatbel, 20, an ethnic Nuer, sits in a hospital bed at a health clinic run by the medical charity Medecins Sans Frontieres (Doctors Without Borders) after receiving a gunshot wound that shattered her femur during tribal clashes near the town of Nasir in southeastern Sudan June 2009. Ethnic clashes threaten a fragile peace in Southern Sudan.