A quick google search gives me this: http://www.knoxnews.com/story/news/2...les/316341001/
They say it was a "unknown toxin" and that they may never know the cause, which is really sad. And apparently the total death count ended up being 34. They ended up deciding to never use that building to house animals again, because they couldn't replicate anything that their sensors were rigged to detect.
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