Boko Haram video claims air strikes have killed some kidnapped schoolgirls

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. The video posted on

Twitter shows one of the alleged victims pleading for authorities to release detained militants so the girls can be freed. The girl, who is wearing a headscarf, has been identified as one of the

276 students abducted from a remote school in north-eastern Nigeria in April 2014.