The two men and two women – who are part of the joint UN-African Union force, Unamid – were abducted after leaving their base in Nyala.
Rebel Movement for the Popular Struggle spokesman Ibrahim al-Dukki said no ransom had been paid.
He said the abduction was to show Darfur was not safe for elections.
A civil war has pushed about three million people into refugee camps in Darfur and the region is prone to lawlessness and banditry.
A number of expatriates, including aid workers and Unamid officials, have been kidnapped by armed groups demanding ransom.
Source: BBC
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