Dozens of people have died in clashes between Southern Sudan's army and George Athor's rebels, officials say.
The fighting began on Sunday in Fangak county, the same area where more than 200 people were killed last month.
Mr Athor defected from the army last year, alleging fraud in state elections, though his group signed a ceasefire agreement in January.
The violence has raised concerns about the stability of a state born only last month in an independence referendum.
George Athor claims 110 people were killed in the latest round of fighting, most of them army soldiers.
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More News On War Returning To Certain Parts Of The South Sudan
Southern Sudan's Army Reports Clashes With Rebel Militia in Jonglei State -- Bloomberg
Dozens Killed In Fresh South Sudan Fighting -- RTT News
US denounces clashes in Sudan's Abyei region -- AFP
Fighting in tense region of Southern Sudan leaves dozens dead only weeks after major attacks -- Canadian Press
Women flee Sudan's contested Abyei, shots heard: UN -- Reuters
Women, kids flee as Sudan violence kills 100 -- CBS News
South Sudan rebel clashes kill 40 soldiers: army -- AFP
More than 100 killed in disputed Sudan region -- AP
South Sudan army clashes with renegade General Athor kills 92 -- Sudan Tribune
U.N. presses for solutions in Sudan -- UPI
Sudan: UN deplores new clashes in region disputed by North and South -- UN News Centre
Familiar trouble in southern Sudan -- Global Post