anne catherine herridge is live with more on the investigation. >> reporter: the use of vehicles as weapons reflects a significant shift by al qaeda and isis to low tech low cost plots that are nearly impossible to disrupt. self-radicalized terrorists are just as capable as those who risk travel to syria, iraq, afghanistan for more formal training. the barcelona attack is the sixth in europe that has used vehicles to mow down civilians with little or no warning. while car accident kill 30,000 to 40,000 people a year, world wide terrorists using cars or trucks kill only a tiny fraction. but an hraoeufts say this kind of attack using one of the most ordinary items makes it all the more shocking. >> from an isis perspective, minimum investment, maximum result. they're very speck hrar attacks carried out in places that have a lot of cameras. the images go around the world, they terrify a lot of people. they capture the imagination and

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