disturbing new report about the growing strength of al qaeda. >> the terror group is being fueled in part by more than 100 american citizens from all over the world, including syria. here's brian ross. >> reporter: they come from small towns and big cities. law enforcement officials tell abc news, including, they say, a man who lived here on monta vice a road in phoenix. 30-year-old eric haru was in the u.s. army on the day of the 9/11 attacks but this year he became one of about a dozen americans who authorities say are fighting in syria with a group that has sworn allegiance to al qaeda called al nusra. >> you're going down in flames. >> his father says he fell in with the wrong people. >> the furthest thing from a terrorist that there could be. >> but lured back to the u.s. by the fbi, he will soon stand trial on charges he helped al qaeda. >> i think that's the most disturbing thing, to see