FILE - In this Tuesday, Jan. 19, 2016 file photo, displaced people walk next to a razor wire fence at the United Nations base in the capital Juba, South Sudan. According to reports from victims which have come to light Monday Aug. 15, 2016, South Sudanese troops, fresh from winning a battle against opposition forces in the capital, Juba, on July 11, 2016, went on a nearly four-hour rampage through a residential compound popular with foreigners, and the U.N. peacekeeping force stationed nearby are accused of refusing to respond to desperate calls for help. (AP Photo/Jason Patinkin, File)