>>7657290 (LB)
Wikipedia lists it as 666ft.
But 2 feet is not much across the area of a town. Different sources may list it differently.
It's conceivable that the shooter or his handlers may have picked this town based on that number. Or maybe not. There have been many of these attacks over the years and each will have countless numbers that can be associated with them. Eventually the number 666 would show up a matter of chance.
I don't think it means much.