Talks are due to begin in Ethiopia to try and stop the fighting in South Sudan.
Members of the Dinka ethnic group said they fled Bor county for Minkamen when rebels loyal to former Vice President Riek Machar attacked their towns and villages.
The total number of people displaced is not yet known.
Government soldiers and rebel fighters are both reported to be violating a ceasefire signed in Addis Ababa two weeks ago.
Al Jazeera's Hoda Abdel Hamid reports from Minkamen, South Sudan.