including going to shooting ranges and had even bought tickets to travel to afghanistan through mexico. >> this was a valid, violent extremist network. we took this very, very seriously. >> reporter: according to the fbi's charges, one of the alleged terror cell members posted violent extremist media, including audio files of al awlaki. abc news has discovered 30 cases brought against homegrown radicals where al awlaki was inspiration. they had plans to blow up the federal reserve building in new york, plots to detonate a car bomb at a chicago bar. all the cases came after al awlaki was dead. some officials fear we may see al awlaki's influence for years to come. he lives on online. pierre thomas, abc new, washington. >> influence from the grave. what's disturbing. the one man, kabir, former member of the u.s. military as you heard in that piece.