This image taken from video on Thursday Feb. 22, 2018, shows the exterior of Government Girls Science and Technical College in Dapchi, Nigeria. Nigeria's security forces failed to respond to several warnings that suspected Boko Haram extremists were on their way to a town where 110 schoolgirls were abducted last month, rights group Amnesty International said Tuesday March 20, 2018. (AP Photo, File)
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