juba six aid workers kidnap rebel south sudan early week release accord unite nations spokesman rebel aid workers french organization solidarites international kidnap sunday travel road near city raja west country release land safely wau another city west country unite nations official juba speak condition anonymity tell reuters say one hold rebel foreigner rebel spokesman lam paul gabriel tell reuters six humanitarian aid workers free belong give back include vehicles clear rebel take aid workers vehicles custody solidarites say statement monday lose contact three members team saturday l8n1oi50m give indication fate immediately clear give different number involve spokesman solidarites paris immediately respond request comment announcement release staff army spokesman juba also respond request comment south sudan one world dangerous countries aid workers 28 aid workers kill year nine shoot dead november alone accord unite nations world young nation embroil civil war kill tens thousands people force third 12 million strong population flee home kidnap aid workers south sudan release u.n. rebel