Keep what hush-hush? It's kind of already in the news.

Apple's insurance will cover damages to the building if they choose to exercise it and workers compensation will cover any employees, but anyone else is on their own unless they can prove negligence on Apple's part. While they might get added to a lawsuit, and might offer to settle if it's less than the legal fees to go to court, it's so cut-and-dry it'll likely be tossed before it's even at that point.