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Throughout the siege, al shabaab members sent audio and written messages to reporters via twitter. and the al shabaab video production unit regularly turns out well-produced propaganda and recruiting videos, many aimed at americans, featuring american recruits like this young man who supposedly came from minneapolis and was killed in fighting after recording this tape. from the group's perspective these individuals are quite useful because they project their ideology on the one hand, they also help bring funding an recruits. >> reporter: the fbi says it knows of no credible threats against ame...

Radical preachers and possibly extremely controversial, but if you had had somebody maybe in his mosque or in the religious community there, he stood up in the mosque twice and challenged his imam who he thought was too moderate. and what veteran counterterror experts will tell you that's a classic sign of radicalization. when someone starts challenging the preacher in the mosque for being a little bit soft. >> let's talk about the muslim community. because there's, you also talk about what the nypd has done to sort of monitor muslim communities, that's been very controversial. but that seems ...

-- counterterror experts so he's gone over there and it's got radicalized. your reaction? >> well, it's no different from what we saw here in the united states of america when the young, black male by the name of carlos bledsoe converted to islam. he received terror training and came back and shot two u.s. soldiers at the little rock recruiting station killing one of them. we have to be very concerned about these lone wolf type of attacks, these one man terrorist cells that will be planted anywhere and this is all about terrorism. this is all about making you very afraid to go to the mall. you...

Violence under the guise of religion. when you listen to him, unlike osama bin laden, for example, you realize allahawki is very tapped in to the western influence. if you need proof, his 5,000 facebook fans back him up. when anwar al awlaki speaks, he speaks largely to a western audience, inspiring and recruiting young men to join his lone wolf insurgency using internet and his american credentials to do so. how dangerous is he considered on a scale of 1 to 10? >> i would say 10. >> reporter: counterterror experts call radical cleric al awlaki osama bin laden's heir apparent. >> often united ...