An attack on the UN compound in Akobo, South Sudan, killed two Indian peacekeepers and prompted the UN to send helicopters to evacuate staff.
An estimated 500 people have been killed since fighting within the Sudan People's Liberation Movement (SPLM) army broke out over the weekend in what the government calls an attempted coup.
President Kiir called the fighting an 'attempted coup' in the world's newest nation.
A United Nations and African Union joint mission traveled to the Central African Republic, Democratic Republic of Congo, South Sudan, and Uganda last week seeking regional cooperation from countries affected by the Lord's Resistance Army.
If a referendum on South Sudan's independence ends with a vote for secession from Sudan, internal clan rivalries could complicate the transition to independence.
As voting ended today in Sudan's election, voters in the south complained about being unable to find their names on the voter rolls. Jimmy Carter says the election is a major stepping stone in the peace process.
International officials and Sudanese say the apparent compromise could be first step on road to peace.