Like others have said, it seems odd that AF came out straight away with there opinions on the cause unless they have more information then they are letting on.
For fellow non-professional pilots commenting on this thread, pleas be careful what you post, news stations and reporters monitor this site and it just helps fuel there overactive imaginations and need to get "The scoop" so they will newsflash all sorts of madness.
These professionals commenting on the likes of Sky news are bad enough. I can only assume they've given up the profession some time ago and taken up the mindset of armchair pilots on MS FS.
Those informed, please keep posting.