US Permanent Representative to the United Nations Samantha Power (C) interacts with a mother in Malcohi Settlement in Yola, Adamawa State on April 22, 2016. US Ambassador to the United Nations Samantha Power arrived in Nigeria as part of a three-country tour of West and Central Africa to hold talks with Muhammadu Buhari on the growing threat Boko Haram poses to the Lake Chad Basin region and to develop a more coordinated military campaign against the Islamists. / AFP / Randy HANIEL (Photo credit should read RANDY HANIEL/AFP via Getty Images)
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