The anti-government sit-in outside the military compound has continued since April 6. The new military rulers are facing increasing pressure to hand power to a civilian government after a coup against Omar al Bashir.
The World Food Programme aid worker had been detained by the government of South Sudan since April 10. Other aid workers have also been detained since civil war broke out in 2013 in the world's youngest nation.
Amnesty International says up to 250 people may have died in likely blister agent attacks.
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