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Usually that requires somebody who is experienced in bomb making. either they traveled overseas and worked with a foreign terrorist group like isis and sir yaryri syria, or this could be isis and libya. you always look to father and friends, that's what we're seeing out here, brothers -- >> what do you make of the father being involved? >> this is not uncommon. usually terror recruitment and plots sometimes are those of the last generation. al qaeda was isis. isis now has tons of foreign fighters that are out there and they will give birth to another generation. >> what do you make of this bei...

Not a rifle, not a car involved, a knife, this is a bomb. are we going to be seeing more of this? >> well, most of the inspired attacks by individuals have really chosen simple types of material like knives as you noted. vehicles. this suggests a more sophisticated attack, which indicates that he likely went to places like libya and syria and trained. we don't know yet whether he conducted training in camps. that's been the historical pattern. if we see more people coming to these places that have trained and have expertise in bomb making, we see more of these types of attacks. ainsley: simple...

Former fbi special agent clint watts is back with me now. clint, a lot of breakdown here. this bomb that rohan was just describing, authorities don't believe he did it on his own. he's 23 years old. how sophisticated was this bomb making, and if he didn't do it on his own, i believe his brother was there. who else was there that could have helped him with that and how wide is the fbi going to expand those raids? >> i think it's key to remember that any time you have a suspect like this, especially a bomb plot, there are usually two people under the plotter who are supporters. you're going to b...

Claimed responsibility, cnn is of course trying to claim that as well. in terms of the investigation, it's the different veins it will take now, the money is always a key concern. if it's a loan wolf, does it cost much money to prepare this kind of explosive device? would he have had to have support from somewhere? >> it depends on how sophisticated the device was, how powerful the device was. the more sophisticated and powerful the device was, the more likely some kind of network might be behind this. but we've seen instances in the past where you've had essentially one man bomb making, plott...

Last night, compared to masood and the westminster bridge attack, whether a more sophisticated attack also implies a higher level of association. stephanie. >> would you agree with that, the fact that this was a more sophisticated style of attack, does that give you any clue that it was more closely tied to organized isis and not a lone wolf? >> it suggests some sophistication, but the challenge we face is that there's been a proliferation of expertise on the internet and there's also a proliferation of communications technology and encryption which allows communications officials can't see. t...