Hey guys. It has already been suggested that the cause of this incident should not be speculated upon. I agree. The public domain is not the place to gossip and spread rumour and counter-rumour. It is the job of the BoI to find out, not for a bunch of half informed scavengers like us to stir it up.
Whatever the cause, let's just all be thankful that everyone got out without so much as a scratch and wait for the Accident Report to tell us the real story.