Short version: big leak in the cyrogenic helium system apparently lead to a Big Boom with the liquid oxygen. And I mean big:
SpaceX may have discovered the cause of the Falcon 9 explosion https://t.co/OmdcaVRv24 pic.twitter.com/pzFAkuemFE
— Popular Mechanics (@PopMech) September 23, 2016
And that, ladies and gentlemen, is what You Will Not Go To Space Today looks like.
“Dammit. the interns lit the fuse at the wrong end of the rocket again….”