By Skye Wheeler

JUBA, Sudan, Sept 19 (Reuters) - South Sudan's military accused Ugandan rebels on Friday of attacking them on the Congo border, killing one soldier and the son of a local chief.

Major General Biar Ajang of the Sudan People's Liberation Army (SLPA) said the attack by Lord's Resistance Army (LRA) guerrillas took place on Thursday in Sukure Payam district.

"They killed one soldier and wounded three others. They also set the child of one of the chiefs on fire," Ajang told Reuters by telephone.

But a spokesman for the rebels said there was no confirmation that Ugandan guerrillas had launched the attack.

"We haven't proved it was the LRA," said chief rebel negotiator David Nyekorach-Matsanga.

Northern Uganda's two-decade civil war killed tens of thousands of people and displaced two million more, destabilising neighbouring parts of south Sudan and mineral-rich Democratic Republic of the Congo.

In June, LRA fighters killed 23 people, including 14 SPLA soldiers, in a similar attack at Namanga the DRC border.

Two years of peace talks in south Sudan between the LRA and the Ugandan government collapsed in April when elusive guerrilla leader Joseph Kony failed to sign a final peace deal.

Kony is wanted for war crimes by prosecutors at the International Criminal Court in The Hague. (Writing by Jack Kimball; Editing by Daniel Wallis)

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