Boko Haram released a video late Saturday of one of its gruesome attacks on civilians. In the video, people appear to be lined along the floors of a school dormitory as the Islamic extremists denounce the civilians as “infidels” and declare “Western education is sinful." The video was released two days after Boko Haram terrorists reportedly rounded up elderly people in the village of Gwoza and shot them in two schools. "We have made sure the floor of this hall is turned red with blood,” the attack group's leader says in the video. "From now, killing, slaughtering, destructions and bombing will be our religious duty anywhere we invade." Since Boko Haram began terrorizing Nigeria, the Islamic extremists have killed thousands and displaced 1.6 million people.