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    U.N. humanitarian chief: South Sudan a dire situation

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U.N. humanitarian chief: South Sudan a dire situation

U.N. humanitarian chief Stephen O'Brien tells CNN's Michael Holmes that "there's a huge amount of tension and insecurity" in South Sudan.

U.N. humanitarian chief: South Sudan a dire situation

U.N. humanitarian chief Stephen O'Brien tells CNN's Michael Holmes that "there's a huge amount of tension and insecurity" in South Sudan.