Is South Sudan on the brink of genocide?Ethnic tensions in <a href="http://www.cnn.com/2016/12/15/opinions/south-sudan-genocide-looming/index.html">South Sudan</a> have erupted into violence. CNN's <a href="http://www.cnn.com/profiles/amara-walker">Amara Walker</a> talks to Michael Bociurkiw, a former OSCE spokesman, about his recent trip to the 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