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That's a record for terrorism arrests for any year since 9/11. with me now, one of the authors of that study, lorenzo vindino, director of the george washington university program on extremism. good morning. >> good morning. good morning to you. >> lorenzo, one of the more disturbing aspects of your study, there's no one profile for those who turn to isis here in the united states. we know the average age is 26, and most are male, but other than that, the people are very different. >> absolutely. it's a staggering diversity. we have men and women. we have completely diverse socioeconomic backg...

In london, i reported on this group for many years. sort of whip young man into a state of righteous indignation about british foreign policy. so it may well be that being part of this group, to some degree with part of their radicalization trajectory that also has affiliated groups that are operating on the east coast of the united states, as well, piers. >> now, the suspected th that w giving his extraordinary interview clutching the machete, he's been identified as michael? >> that's correct. >> and is he the suspect you were talking about just then who had attended these rallies? >> that's...

Sort of whip young man into a state of righteous indignation about british foreign policy. so it may well be that being part of this group, to some degree with part of their radicalization trajectory that also has affiliated groups that are operating on the east coast of the united states, as well, piers. >> now, the suspect that we saw giving his extraordinary interview clutching the machete, he's been identified as michael? >> that's correct. >> and is he the suspect you were talking about just then who had attended these rallies? >> that's absolutely right. that he was the suspect that atte...

In london, i reported on this group for many years. sort of whip young man into a state of righteous indignation about british foreign policy. so it may well be that being part of this group, to some degree with part of their radicalization trajectory that also has affiliated groups that are operating on the east coast of the united states, as well, piers. >> now, the suspect that we saw giving his extraordinary interview clutching the machete, he's been identified as michael? >> that's correct. >> and is he the suspect you were talking about just then who had attended these rallies? >> that's...

Radicalization trajectory seems to be ideological in nature. not all radicalization is ideological. the younger brother was a pot smoker, drinker, partier, womanizer. >> he had friends. >> both of them had friends. tamerlan, if you look at him, he actually fit in quite well as a bhoxer. he was extremely flamboyant, wearing furs, leather pants, silk scarves, things like that. he went through a radical change. but they had two trajectories. i wouldn't in this case blame the united states not doing enough to assimilate the immigrants. if you compare immigrants in the united states to other europe...