It's deja vu all over again.
This was back in 1987, but exactly the same thing happened with the 2003 Congressional report on 9/11. That 2003 report had virtually an entire section redacted; the blacked-out material was widely reported to have been about Saudi Arabia, specifically about Saudi financing of al-Qaeda.
Here's a link: Bush Won't Reveal Saudi 9/11 Info, CNN, July 29, 2003.
If I recall the current 9/11 report correctly it "exonerated" Saudi Arabia. But then mentioned that charities connected with the Saudi Arabian govt. may have been involved.
So Saudi was not "exonerated" and certainly the Saudi govt. would have never acted without intermediates. It sounded like a cover up to me, with a deflective exoneration to deter most inquirers from looking further.