Intense tribal conflict in South Sudan's Jonglei state has resulted in thousands of deaths and many more injuries, despite the launch of one of the most expensive humanitarian interventions in the region's history,

The UN is confident that enough food and shelter can be provided for the displaced, but if the fighting resumes, as is predicted, there is concern that there will not be enough resources for the people of Jonglei.

Al Jazeera's Anna Cavell reports from Pibor, in the east of the country.