Somewhat reminiscent of how the Feds convinced the MSM that John Doe #2 did not exist.
Or that the plane that went down in Queens a month or so after 9-11 was just a batch of bad bolts. The tail "just fell off". Happens all the time.
I am in Connecticut and was listening to the local new accounts at the time. WCBS was airing multiple credible witnesses claiming that they saw some manner of explosion.
Faster than you can say "John Doe #2", they all clammed up and everyone started reciting the party line.
And just like Boron's statement on Joel, The official explanation came out way too soon for anyone to really know.
I believe that I heard fairly recently that the Canadian Intelligence says that it was, in fact, a shoe bomb.