Clashes between Sudan's army and Darfuri Arab tribes have killed 58 people.
Sudan's oil-producing south is allowed to keep a separate army and form a semi-autonomous government in a 2005 peace deal ending more than two decades of civil war with the north.
Southerners will vote in a referendum on 9 January 2011 on independence.
The SPLA said they were attacked by the northern army (SAF) in Raja, a remote part of Western Bahr al-Ghazal state, near where at least five officials from the dominant northern National Congress Party and four others were killed by an SPLA soldier during five days of voting which began on 11 April.
‘Our company came under attack from the SAF forces yesterday afternoon, SPLA spokesman Malaak Ayuen said late on Saturday. ‘The SAF was using four land cruisers with mounted machine guns.’ He could not give further details.
A SAF spokesman denied any involvement but confirmed the SPLA attack on the Rizeigat in Darfur, calling it ‘ a clear violation of the (peace deal).’
Results of the elections, marred by boycotts in the north and opposition accusations of fraud, are slowly being announced after days of delays.
The NCP and the ex-southern rebel Sudan People's Liberation Movement are expected to form a coalition government as both parties look set to maintain their respective dominance in the north and the south.
The international community is concerned that only eight months before the 2011 plebiscite on independence, issues like the demarcation of the north-south border, grazing rights of nomadic tribes and citizenship have not been agreed.
The north-south civil war, Africa's longest, has raged on and off since 1955. It claimed 2 million lives mostly through hunger and disease and destabilised much of east Africa.
The south, which follows mostly Christianity or traditional religions, fought the mainly Muslim north over issues including oil, ethnicity and ideology.
