The Inter-Governmental Authority on Development or IGAD special envoys condemned fresh clashes between the government and SPLM/A in opposition.
Seyoum Mesfin of Ethiopia and Lazarus Sumbeiywo of Kenya warned in a statement that the new attacks would undermine the ongoing mediation process and worsen the suffering of South Sudanese.
They expressed serious concerns over reports of ongoing clashes in various locations across Upper Nile, Jonglei, Warrap and Unity states.
The statement said the fresh clashes which begun on Tuesday was in violation of the Cessation of Hostilities Agreement signed by both parties.
The envoys strongly urged the parties to immediately adhere to the agreement and continue with their strong commitment to peace process.
IGAD top officials said the crisis in South Sudan could not be resolved by military means, but through a political dialogue.