Denis Dumo of Reuters reports that rebels in South Sudan have kidnapped local people working for a U.S. charity and demand aid deliveries as ransom, link here.
The kidnappings do not appear to involve people from the US working for the charity.
But such incidents can chill the willingness of people to go to very undeveloped or unstable countries for humanitarian purposes.
Some churches send people (even young adults of college age) on missions in such countries.
A local Arlington Presbyterian church has connections to a ministry in South Sudan.
Wikipedia attribution link for USAID P.d. aerial picture of Juba.