Jihadi John appeared to be the ISIS militant shown in a video last month demanding a $ 200 million ransom to spare the lives of two Japanese journalists . Officials : Militant known as Jihadi John is Mohammed Emwazi . Advocacy group CAGE says it had contact with him . London 's Metropolitan Police refuse to confirm his reported identity .
Officials : Militant known as Jihadi John is Mohammed Emwazi . Advocacy group CAGE says it had contact with him . London 's Metropolitan Police refuse to confirm his reported identity .