The Waco police information officer conducting the morning briefing at 4:45 CDT this morning said that they would be treating the fertilizer plant as a crime scene until they ruled out criminal activity.
At that point, if nothing was found, it would convert to an industrial accident investigation.
He went on to say that they have no reason to believe, at this time, it was criminal in nature, but that is the way the investigations will be run.
Maybe so...but I tend to think it was a gut reaction....time will tell.