CHANGES SPELLING OF LOCATION TO MATCH AP STORY - Nigerian girls who fled Boko Haram to Chad gather in a school set up by UNICEF at the Baga Sola refugee camp in 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 2015 as Boko Haram intensified its attacks in the area. After the Baga massacre, another 15,000 came bringing the total now to about 18,000, Chadian authorities believe there are more than 2,000 others still trapped on islands, awaiting transport to the safety of a refugee camp though there are more arriving each day in one of the poorest countries on Earth. (AP Photo/Jerome Delay)

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