A masked, camouflaged fighter who appears in the 11½-minute video said many of the schoolgirls died in the strikes, according to the SITE Intelligence Group, which monitors militant jihadist groups. The unidentified fighter also demanded the release of imprisoned militants in exchange for the release of the girls.
The strikes are part are part of a broader offensive by the Nigerian military to rid the region of Boko Haram.
The abduction of more than 250 schoolgirls from Chibok, a small village in northeastern Nigeria, more than two years ago triggered global outrage and a social media campaign using the hashtag #BringBackOurGirls that got the attention of Michelle Obama. Hundreds of other girls and boys have also been kidnapped and murdered by the group.
There was no immediate comment from the government or the military about the video, although President Muhammadu Buhari said last year that he was open to negotiating with the group.