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For a truck to veer off the road the way he did. he must have known the area. >> yeah, it's good if we can get video of that dry run and see what he did, i think that's something they're looking for now. that shows the preplanning this individual was involved in. and we've heard preplanning back a couple months but also back in the complaint. they saw it's possibly been a year he's been planning this. although it was unsophisticated to the degree of what he used, he did do preplanning which indicates that he was looking online, he was looking at what isis was putting out online and he did have...

Form former sofft -- soviet union has military and training from their country, that's what make them so good. >> does the u.s. foreign intelligence kick in at this point and where do they focus? >> the fact he's been in the united states for several years he qualifies as such person. you have intelligent committees look at wlorntd there was ties overseas. in addition to the fact that not only as phil mentioned before, you're looking at all the sir come fresnos of connections around him. you're also trying to decipher what his background was prior to the seven years he spent in the united stat...

Scream shots. >> reporter: an ohio state police officer shot and killed the attacker, police bereaved was inspired by isis. gary tuchman, cnn, atlanta. >> perspective from our law enforcement and national security experts. i want to welcome cnn investigator reporter and international affairs, michael wise. phil muddy, james gag llano and cnn agent nanny. you know this kind of attack well. unless you're going to put up -- on street corners it's impossible to stop suspects if they're going to -- >> absolutely anderson, over our shoulders where the path of the driver ended over here, it's not far...

Desert bad land regions, but make no mistake they had already disdispatched sleeper cells and operate tifrs into europe and russia to buy their time and wait and coordinate attacks like this. now to phil's point what language was this guy talking to other people in, was it russian, arabic or english. you're going to see fbi camped out this address in florida, trying to figure out everybody he talked to, what kind of mosque he was going to. keep in mind you ono longer have to reach raqqah h 2 to be a part of isis. >> a lot more to learn. we're going to continue covering this.

Investigation, does that note change things in your mind, phil? >> it does. you'd have to assume that there's connectivity, even if you're talking to them. you got to assume at the outset there's more significant theory. >> so you want to assume there is and prove that there isn't? >> that's right. you don't want to go into this thing thinking he looks a little shaky. number one, is he communicating with people who are other isis sympathizers who might have seen this and said now i'm going to react on facebook as he travels. seven years in the united states we got to create what he's done in t...