The cause of the fire has not been officially determined, but it happened at a nearby restaurant called Ollie's Noodles.
In my opinion, it would make a lot more sense to guess "Restaurant accident causes fire" than to guess "Someone tried to steal some iPads by incinerating them," but admittedly I am just guessing.
http://www.dnainfo.com/new-york/20130103/lincoln-square/fire-breaks-out-broadway-restaurant-near-lincoln-center-fdny-says