According to
MDE, it is closed. I'd be shocked if it was open just 30 minutes or so after the fire was put out. It's extremely dark and safety checks have to be done not to mention that everything is wet now from the hoses. This entire process takes awhile. If it is, in fact, open already, that would have me very concerned.
UPDATE: Latest rumor is that it will be open within the next 30-45 minutes. The industrial lights are on and melted plastic is visible. Again this is all rumor.