article_snippet.sent: In the refugee camps, thousands of school-age refugee children cannot attend school because of lack of classrooms and teachers," Ahua said.
article_snippet.sent: Mental health needs are crucial to help the survivors of physical attacks and those who've witnessed violence, according to the U.N.  
article_snippet.sent: Some children are separated from Some children parents amid the trauma.
article_snippet.sent: The conflict has had a devastating impact on children, including many who were forcibly recruited by the insurgents in northeastern Nigeria," Ahua said.
article_snippet.sent: CNN's Pierre Meilhan contributed to this report .