A U.N. humanitarian report and aid workers caught in the crossfire reported on Wednesday an increase in violence in a new front near the already tense internal border between north and south Sudan, with dozens of people reported killed in attacks.

The violence in South Kordofan has killed at least 25 people, a U.N. humanitarian report said, though it said local sources indicated that up to 64 people had been killed. The north also bombed an airstrip, preventing the movement of food aid and humanitarian workers.

Fighting also broke out Wednesday in Abyei, another hot-button border region that the northern military invaded in May. A southern military spokesman said Wednesday’s clash resulted in casualties but that he didn’t have exact figures.

The increased violence comes less than a month before Southern Sudan will declare independence from the north on July 9, the culmination of a 2005 peace deal that ended more than two decades of civil war that killed some 2 million people.

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