Boko Haram leader Abubakar Shekau is seen surrounded by his fighters in this still from a video released by the group on October 31, 2014. AP
Boko Haram leader Abubakar Shekau is seen surrounded by his fighters in this still from a video released by the group on October 31, 2014. AP

ISIS affiliate releases video of Nigerian aid workers begging for their lives