I just found out about Nick Berg, the guy who got beheaded on video in iraq, and it's weird. He goes, gets detained by the military, he gets out and instead of getting on a plane he drives to Baghdad where is captured.
But it just so turns out he's friends with the 9/11 hijacker? Wtf guys
This thread lays out a myriad of individuals that were seen with McVeigh and Nichols leading up to the attack. The FBI had every incentive to follow up on these individuals, but either half assed it or didn't bother at all