Boko Haram: Some abducted Chibok girls killed in air strikes

FILE - This Monday May 12, 2014 file image taken from video by Nigeria's Boko Haram terrorist network, shows the alleged missing girls abducted from the northeastern town of Chibok. A video that appears to be from Boko Haram says some of the abducted Chibok schoolgirls have been killed in Nigerian air strikes and shows one of the alleged victims pleading for authorities to release detained militants so the girls can be freed. The video posted Sunday Aug.14, 2016 on Twitter shows a veiled girl identified as one of the 276 students abducted from a remote school in northeast Nigeria in April 2014, saying some classmates died in aerial bombardments and 40 have been "married" to Islamic extremist fighters . (AP Photo/File) (The Associated Press)

This undated image taken from video distributed Sunday, Aug. 14, 2016, shows an alleged Boko Haram soldier standing in front of a group of girls alleged to be some of the 276 abducted Chibok schoolgirls held since April 2014, in an unknown location. The video posted on Twitter appears to come from the Boko Haram islamic extremists making threats about the safety of the captive girls if the government battles against the group. (Militant video/Site Institute via AP) AP CANNOT INDEPENDENTLY VERIFY THE CONTENT, DATE, LOCATION OR AUTHENTICITY OF THIS MATERIAL (The Associated Press)

"Bring Back Our Girls" co-founder Obiageli Ezekwesili, left, console Esther Yakubu, mother of one of the kidnapped school girls, after she saw her daughter in a video release by Boko haram during a briefing in Abuja, Nigeria. Sunday Aug. 14, 2016 . The mother of one of the Chibok girls kidnapped more than two years ago by Nigeria's Islamic extremists on Sunday saw the first proof her daughter is alive — a video of her begging Nigeria's government to exchange detained militants for the girls' freedom. (AP Photo/Olamikan Gbemiga) (The Associated Press)