Copenhagen - The Norwegian Refugee Council said on Friday that one of its staffers in South Sudan has been detained by the turbulent East African country's National Security Service.
Security officials came to the NRC offices in the capital, Juba, on Thursday and a male employee "was asked to come along," NRC spokesperson Tuva Bognes told The Associated Press.
She didn't identify the employee and said more details would be made available on Friday.
"We have, unfortunately, no information as to why he is being held," Bognes said.
NRC staffers have not yet been able to meet with their colleague, she said.
South Sudan Minister of Information Michael Makuei could not immediately be reached for comment.
The NRC, a nonprofit organization, has been in South Sudan since its independence in 2011, and it stepped up its activities after civil war broke out there three years ago.
In recent weeks, UN Secretary-General Ban Ki-moon has warned that there is "a very real risk of mass atrocities being committed in South Sudan, in particular following the sharp rise in hate speech and ethnic incitement."