Surgeon Jose Sanchez (L) from Spain operates on a soldier at a health clinic run by medical charity Medecins Sans Frontieres (Doctors Without Borders), after the patient was brought in with four-day old shrapnel wounds and a leg shattered by a rocket propelled grenade explosion, in the town of Nasir in southeastern Sudan, June 21, 2009. Tribal violence in south Sudan that has killed hundreds of people in recent months and displaced thousands more in the past week. Attacks stemming from disputes over cattle have escalated in recent months in south Sudan between two rival ethnic groups in an area where livestock are prized by southern pastoralists and represent wealth, status and stability in fraught times. Reuters Pictures 7 months ago

Surgeon Jose Sanchez (L) from Spain operates on a soldier at a health clinic run by medical charity Medecins Sans Frontieres (Doctors Without Borders), after the patient was brought in with four-day old shrapnel wounds and a leg shattered by a rocket propelled grenade explosion, in the town of Nasir in southeastern Sudan, June 21, 2009. Tribal violence in south Sudan that has killed hundreds of people in recent months and displaced thousands more in the past week. Attacks stemming from disputes over cattle have escalated in recent months in south Sudan between two rival ethnic groups in an area where livestock are prized by southern pastoralists and represent wealth, status and stability in fraught times.