Nigeria kidnapped girls 'shown' in new Boko Haram video

New video claiming to show a number of the kidnapped Nigerian schoolgirls has been released by the Islamist militant group, Boko Haram.

The girls shown in the video are wearing full hijab. Boko Haram's leader, Abubakar Shekau, said the girls had converted to Islam and that would be held until all imprisoned militants had been freed

The BBC's John Simpson says the video could be the first step in a negotiated settlement.