and one analyst says the isis leader, al baghdadi, what this analyst calls a narcis icissist psychopaththeir plans in the future. >> british prime minister david cameron confirmed that foley's executioner is british. are there americans among the ranks of isis, brian? >> we're being told, don, it's very likely there are americans within the ranks of isis. u.s. intelligence officials have told us more than 100 americans have gone to syria to fight with jihadist groups, and it's looking increasingly likely that at least a handful of them have joined isis. now the fear is they've got american passports, trained on combat, on bomb making and other things and also it's hard to track them. u.s. intelligence assets human intelligence in syria especially is not very extensive, don. >> so who exactly is -- brian todd, thank you very much. i appreciate that. the question is who exactly is the ruthless jihadist believed to be the masked executioner who beheaded american james foley? the evidence investigators are scouring through next. we're going to talk about that. ifyou may be muddlingble withr