Neve, who is in Juba, said supply lines at refugee camps have been cut off and failure to get key supplies before the rains will lead to a humanitarian crisis.

CNN: South Sudan says it is withdrawing from disputed oil region

Neve, who is in the South Sudan capital of Juba, said supply lines at refugee camps have been cut off and failure to get key supplies before the rains will lead to a humanitarian crisis.

CNN: Sudan president vows to 'punish' South Sudan

The Federal Reserve, confronted with a global stock sell-off fanned by increased fears of an American recession, cut a key interest rate by three-quarters of a percentage point on Tuesday, the biggest one-day move by the central bank in recent memory.

NPR: Fed Sends Signal with Deep Cut to Interest Rate