Marc Marginedas , 46 , was held by ISIS militants for six months last year . He says he was guarded by at least one men who spoke with British accents . Group nicknamed The Beatles because they regularly 'beat ' prisoners . Jihadi John - later identified as Mohammed Emwazi - was the gang leader . He would draw on the prisoners heads with a red pen to mark out who he next planned to brutally execute in a filmed beheading . When his pencil was blunt he would scratch a cross into next victim 's head .
Marc Marginedas , 46 , was held by ISIS militants for six months last year . He says he was guarded by three men who spoke with British accents . Group nicknamed The Beatles because they regularly 'beat ' prisoners . Jihadi John - later identified as Mohammed Emwazi - was the gang leader . He would draw on the prisoners heads with a red pen to mark out who he next planned to brutally execute in a filmed beheading . When his pencil was blunt he would scratch a cross into next victim 's head .