As far as it being a school I teach at or my child attends? Those plans aren't on the internet as these are 40+ year old buildings. Newer schools routinely have their plans online so they are available for public approval and public discussion. But I knew about this months ago - in fact, you and I had an exchange about it.
I'm not sure why you posted this to me--was it to scare me, anger me, disturb me, inform me? My point stands - we are all targets wherever we are and wherever we go by virtue of being Americans. When one American is threatened, we should all feel threatened, not superior because we think we do something that will keep us fundamentally safe. That is a false security. Dead is dead.
BTW Virginia has conceal-carry laws. Granted, bringing a gun into a school is against the law, but I'll bet many will take their chances with a judge than with a terrorist.