For connectivity reasons, I am not in a position to write much about this tragedy. Thanks to this comprehensive post by Miles O'Brien, there's no need to. The analysis laid out here seems very, very convincing -- and does an artful job of balancing the necessary "it's too soon to be sure" caveats with the compelling "evidence strongly points in one direction" argument.
Many people know O'Brien from his CNN reports; though I don't know him personally, I think of him as a fellow Cirrus pilot -- he flies the same kind of small airplane I used to back in the US. Very much worth reading.
(Thanks to Jay Brodsky.)