I don't think it is likely that something this elaborate in a public area can be completed without leaving a tonne of evidence. I suspect eventually we will know who did it and what the motive was. Or if there is a lack of a motive, which seems unlikely though considering the effort that must have went into it. Being an FBI investigation though, I don't suspect any unessential information to be released soon.
If we are just speculating, I am going to go with a very bitter person committing suicide in a spectacular fashion that can't be ignored.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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