U.S. Marines are poised to enter South Sudan to help evacuate Americans and provide security for the U.S. Embassy, after hundreds of people were killed during a week of fighting. Thousands of civilians have taken refuge in United Nations bases within South Sudan. Secretary-General Ban Ki-moon addressed the people in a message, "You are seeing people leave the country amid increasing chaos. The U.N. will stay with you."
Pentagon Correspondent Barbara Starr reports.
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