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A woman attends a demonstration calling on the government to rescue the kidnapped school girls of a government secondary school Chibok, outside the defense headquarters in Abuja, Nigeria, Tuesday May 6, 2014. Their plight — and the failure of the Nigerian military to find them — has drawn international attention to an escalating Islamic extremist insurrection that has killed more than 1,500 so far this year. Boko Haram, the name means "Western education is sinful," has claimed responsibility for the mass kidnapping and threatened to sell the girls. The claim was made in a video seen Monday. The British and U.S. governments have expressed concern over the fate of the missing students, and protests have erupted in major Nigerian cities and in New York. (AP Photo/Sunday Alamba)
A woman attends a demonstration calling on the government to rescue the kidnapped school girls of a government secondary school Chibok, outside the defense headquarters in Abuja, Nigeria, Tuesday May 6, 2014. Their plight — and the failure of the Nigerian military to find them — has drawn international attention to an escalating Islamic extremist insurrection that has killed more than 1,500 so far this year. Boko Haram, the name means "Western education is sinful," has claimed responsibility for the mass kidnapping and threatened to sell the girls. The claim was made in a video seen Monday. The British and U.S. governments have expressed concern over the fate of the missing students, and protests have erupted in major Nigerian cities and in New York. (AP Photo/Sunday Alamba)

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    Parents of kidnapped girls speak out

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Parents of kidnapped girls speak out

CNN's Erin Burnett talks to Vladimir Duthiers about his interview with parents of two girls kidnapped by Boko Haram.

Parents of kidnapped girls speak out

CNN's Erin Burnett talks to Vladimir Duthiers about his interview with parents of two girls kidnapped by Boko Haram.