JUBA - South Sudan on Wednesday denied accusations by Khartoum that it was helping rebels in South Kordofan, Sudan's main oil-producing state, where fighting broke out with government troops in June.
The south won independence from the north last month after a January referendum promised in a 2005 peace deal that ended decades of civil war in the vast African country.
Sudan sent a letter to the UN Security Council on Tuesday accusing the south of causing instability and disrupting peace in the neighboring state of South Kordofan.
"This is an absolute lie on behalf of the government in Khartoum. We are not giving any support to the rebels," South Sudan's Information Minister Barnaba Marial Benjamin told Reuters.
The Sudan People's Liberation Movement-North (SPLM-N) fought alongside its southern counterpart against Khartoum during the civil war in which some two million people perished.