Amnesty International has gathered evidence that the Nigeria government became aware of Boko Haram's plan to attack the girl's school about four hours before the attack, but failed to mobilize to stop it.

"But an inability to muster troops – due to poor resources and a reported fear of engaging with the often better-equipped armed groups – meant that reinforcements were not deployed to Chibok that night. The small contingent of security forces based in the town – 17 army personnel as well as local police –attempted to repel the Boko Haram assault but were overpowered and forced to retreat. One soldier reportedly died."

There are just no words.