“We have made sure the floor of this hall is turned red with blood, and this is how it is going to be in all future attacks and arrests of infidels,” the group leader says in a message. “From now, killing, slaughtering, destructions and bombing will be our religious duty anywhere we invade.”“Boko Haram releases video of extremists killing civilians,” Washington Post, December 21, 2014, http://www.washingtonpost.com/world/boko-haram-releases-video-of-extremists-killing-civilians/2014/12/21/8549fcd4-8954-11e4-a085-34e9b9f09a58_story.html.