>> this concern about individuals within the united states increasingly resonated, if you will with the ideology of isil and the idea of just acting violently indiscriminately is clearly of great concern. it's a trend that things would suggest is increasing not decreasing. >> reporter: there's one key issue about isis that necessarily you don't have to have these attackers speaking to isis leadership. they can simply be inspired and act independently, the lone wolf if you like. i should point out that mike rongers is talking in a climate in which the nsa will be looking to renew its broad surveillance powers simply in the weeks ahead. that may be feeding into some of the sense of urgency in his comments and also too he spoke on a day in which we often see another video emerged online in which isis supporters claim they have plenty of hacking attacks ready to jeopardize the u.s. a climate of concern building