No motive has been released by the PD.
From the description it would appear he’s either some sort of Antifa Goon or was just trying to rob the place.
According to at least one witness he was in all black, black facemask tossed a pile of smoke bombs around the room, and was heading for the cash register.
Only 12 shots were reported which is a very low number for someone intent on a mass casualty event.
Either it was an idiot wannabe lone terrorist or a robbery gone bad most likely but we won’t know anything for at least several hours or even days other than perhaps the perp’s name and prior history with LEO’s if any.