Timeline: Nigeria's kidnapped Chibok schoolgirls

MAIDUGURI, Nigeria - The abduction of almost 300 Chibok schoolgirls by Boko Haram extremists more than two years ago shocked the world. On Thursday, Nigeria's government announced that 21 of the girls had been freed after its negotiations with Boko Haram. It is the first release of any of the students as a result of government action. Here are some of the key events surrounding the crisis:


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