Some of the abducted Chibok schoolgirls have been killed in Nigerian military air strikes, according to a new video appearing to come from Boko Haram Islamic extremists, which shows one of the alleged victims pleading for authorities to release detained militants so the girls can be freed.

The video posted Sunday on Twitter shows a girl in a headscarf, identified as one of the 276 students abducted from a remote school in northeastern Nigeria in April 2014, claiming that some of her kidnapped classmates died in aerial bombardments by the Nigerian military. She also said that 40 have been “married” to Islamic extremist fighters.

The video, posted by Nigerian journalist Ahmad Salkida and cited by SITE Intelligence Group, also shows a fighter warning in the Hausa language that if President Muhammadu Buhari’s government battles Boko Haram with firepower, the girls won’t be seen again.

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