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A spokesman for the Norwegian Foreign Ministry, Frode O. Andersen, said Oslo “had demanded access to the Norwegian citizen.”

“We have asked for a clarification on why he was arrested, and we want to find out the charges against him,” Mr. Andersen said.

Britain’s Foreign Office confirmed that a British national had been detained and said it was “urgently investigating” the details of the arrests. The ministry said it had requested immediate access to the Briton, but officials had no other details.

The South African Foreign Ministry said Sunday it is following up on reports of the arrest of a South African man in a mine-clearing detail near the South Sudan border.


Associated Press writers Jan M. Olsen in Copenhagen, Denmark, David Stringer in London, and Angus Shaw in Harare, Zimbabwe contributed to this report.