CHANGES SPELLING OF LOCATION TO MATCH AP STORY - Nigerians who fled Boko Haram to Chad walk at the Baga Sola refugee camp near the shore of Lake Chad Wednesday March 4, 2015. The camp, jointly run by the Chadian government and UNHCR, opened mid-January 2015 and hosts over 6000 refugees. Officials say that several thousand had arrived in Chad by the end of 2014 as Boko Haram intensified its attacks in the area. (AP Photo/Jerome Delay)

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