Conflict in disputed oil - rich northern areas and fears of return to civil war . Up to 50,000 people displaced by latest outbreak of violence . Despite cease - fire , Abyei has been destroyed and deal is at risk .
Fighting in disputed oil-rich Sudan town raises fears of return to civil war . Up to 50,000 people displaced by latest outbreak of fighting . Despite cease-fire agreement Abyei has been destroyed and deal is at risk .