Not really anything new in the news... we already figured it was a gas explosion. And that the condo was only being rented by temps lends more credence to the possibility that someone left the gas on and no one noticed (if they were in at the time, they would have smelled it?)

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A CHB wall might have saved the delivery driver's life, since the debris would have scattered further out, but would have carried the possibility of killing/injuring/maiming more people.