Yeah, I'm getting a bad feeling about that one, too.
If it was an unfortunate accident due to power failure or thermostat failures, they would have been able to establish that pretty quickly, I would think?
I hope this wasn't something along the lines of "PETA" or a disgruntled ex employee or some reptile haters bent on causing mayhem. A accident is heart breaking enough as it is, but the thought of someone doing this willfully.
Such a shame all around. I hope they will update after the investigation.