A new video released by Islamist militant group Boko Haram claims to show the kidnapped schoolgirls from Nigeria for the first time. More than 100 girls are seen sitting outside in a group wearing veils and praying in an undisclosed location. In the full video, which is 17 minutes long, the leader of the Islamist group, Abubakar Shekau, says the girls have converted to Islam. The Guardian has concealed the girls' faces to protect identities