JOHANNESBURG - The Department of International Relations has been unavailable to comment on the capture of a South African man by the Sudanese army.
Sudan's Defence Ministry confirmed on Sunday that four foreigners, including the South African, were arrested in the disputed Heglig oilfield on Saturday.
Over three weeks of border fighting between Sudan and South Sudan's 1,800 km contested Heglig border has brought the African neighbours close to a civil war, after the South gained independence from Sudan in July, under a 2005 settlement.
The economies of both countries are being damaged, as oil production in the region has already been halted.
The suspects are being accused of engaging in alleged suspicious activities, including investigating war debris.
It is reported the South African man and his South Sudanese colleague were in Sudan as part of a contract with the United Nations, to help with de-mining.
South African de-mining company Mechem, said its employees have full United Nations immunity.
Sudanese media have reported that the two men and their co-accused, a Norwegian and Briton, were in an armored vehicle and are suspected of aiding South Sudan in the conflict - a claim the country has denied.
The Sudanese army said all four men have been taken to the capital, Khartoum, for questioning.
(Edited by Thato Motaung)