The mall is huge, and far enough away from Newark that this won't cause it to close. Millburn NJ had a homicide rate of about -0- before this. It's a bolt-of-lightning event that's unusual enough that it made the national news.
http://www.usa.com/millburn-nj-crime-and-crime-rate.htm
And unless the perps wore space suits, they left enough evidence behind in the car that they should be arrested, eventually. My guess is within the week.
Maybe. I hope you're right.
My guess is they start hauling all that expensive marble out of there as soon as Cartier, Hermes, Tiffany, and Max Mara wave bye-bye.