A spokeswoman for the UN Mission in South Sudan said the four were on a de-mining mission

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A spokeswoman for the UN Mission in South Sudan said the four were on a de-mining mission

Ashraf Shazly

Foreigners captured by Sudanese military in the Heglig oilfield area April 28, are escorted off an airplane in Khartoum. The British embassy was "urgently" investigating on Sunday the arrest in Sudan of one of its citizens, who was among four foreigners the Sudanese military said it captured in the tense Heglig oil region.