arabia helped the 9/11 hijackers. we get more now from cbs s catherine herridge, including an exclusive interview with two former investigators. reps that s my dad.en his father reporter: eagleson is now leading a group of 9/11 families battling their own government to release still-secret f.b.i. files from the case. it s a ten-year-long investigation, that specifically investigated the role that the kingdom of saudi arabia played in supporting the hijackers. reporter: the case, code-named operation encore, centered on the two hijackers that lived in san diego, and who assisted them. is that the first mosque they went to in san diego? this is it right here. reporter: danny gonzalez was an f.b.i. agent who worked on operation encore, and showed us the neighborhood the hijackers lived in. this is his first television interview about the case. 19 hijackers cannot commit 3,000 mass murders by