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Abuja, Nigeria (CNN) - Nigerian military commanders knew that Boko Haram militants were on their way to raid a boarding school at least four hours before 276 girls were abducted last month, human rights group Amnesty International reported Friday.
But commanders weren't able to raise enough troops to respond and so left a contingent of 17 soldiers and a handful of police officers based in the town of Chibok to fend off the militants, the group reported, citing senior Nigerian military officials and "multiple interviews with credible sources."
Borno state Sen. Ahmed Zannah said Friday that the military sent reinforcements, but not until the militants were already in Chibok.