Yemen : Boys say they were among 100 captives taken by ISIS on way back from exams . The boys say they and their fellow captives were beaten with clubs and cables . ISIS militants forced them to take religious lessons , and beheading videos . ISIS has allegedly kidnapped , tortured and killed in its campaign in Syria , Iraq .
Group : 4 say they were among 100 boys taken by ISIS on way back from exams . The boys say they and their fellow captives were beaten with hoses and cables . ISIS militants forced them to take religious lessons , watch beheading videos . ISIS has allegedly kidnapped , raped and killed in its campaign in Syria , Iraq .