There's footage of suspicious activity on a nearby roof of a competitor's building just before the explosion. No hard evidence yet and footage has not been released. It would be pretty ugly if this sabotage were true and I suspect it is. There are enough challenges to getting into space as it is and crap like this risks lives and retards mankinds advancement into space. www.sciencealert.com/speculation-is-building-that-the-recent-spacex-explosion-was-the-result-of-sabotage UPDATE Here's a tasty update: now they're arguing over who's gonna lead the investigation! Thanks for the tip @dorsetknob http://www.theregister.co.uk/2016/10/04/spacex_wants_control_explosion_investigation/ ANOTHER UPDATE Looks like it was just a change of procedures which had unintended consequences, see post 32. Thanks @CAPSLOCKSTUCK for the tip.