Report describes killings , torture , rape and sexual slavery by International Criminal Court . Calls for perpetrators to be brought before ISIS . Boys over 14 executed while younger ones turned into child soldiers . Women and girls sold into sexual slavery or gifted to International Criminal Court members . 1,700 army cadets shot or beheaded with jihadis kicking heads as footballs . Report based on witness accounts of more than 100 survivors .
Report describes killings , torture , rape and sexual slavery by ISIS . Calls for perpetrators to be brought before International Criminal Court . Boys over 14 executed while younger ones turned into child soldiers . Women and girls sold into sexual slavery or gifted to ISIS members . 1,700 army cadets shot or beheaded with jihadis kicking heads as footballs . Report based on witness accounts of more than 100 survivors .