An unknown number of Chibok schoolgirls kidnapped three years ago by Boko Haram extremists in northern Nigeria have been released. April 13, 2016: Boko Haram video appears to show some of the Chibok girls, and tearful mothers recognize their daughters. Aug. 14, 2016: Boko Haram video says some Chibok girls are killed in airstrikes and demands release of extremists in exchange for the other girls' freedom. Oct. 13, 2016: Spokesman for Nigeria's president confirms 21 Chibok girls have been freed, a result of government negotiations with Boko Haram. Dec. 24, 2016: Nigeria's president declares that Boko Haram has been crushed, driven from its last forest hideout.

Source: Fox News May 06, 2017 21:00 UTC