Nigerian army failed to act on warnings before schoolgirls abducted, Amnesty says

Lagos, Nigeria (CNN)Amnesty International has accused the Nigerian army of failing to act on "advance warnings" given a few hours before Boko Haram militants abducted 110 girls from a school in northeast Nigeria last month.

In a new report, the human rights group alleges the army and police received at least five calls on the afternoon of February 19, warning them that gunmen were heading to the Government Girls Science and Technical College in Dapchi town.

It cited evidence from eye witnesses and residents who claimed they alerted Geidam army base in the Nigerian state of Yobe and local police after they saw a convoy of gunmen heading towards the girls' school.

Amnesty has called for an investigation into circumstances that led to the schoolgirl's kidnapping.