Darkstone42
Oh.
A squirrel did it ad blacked out an entire grid from Ohio to New York.
So wait, we've jumped from "Tourists in a tourist area" to "ZOMG! POWER GRID!"
If anyone's planning to do that, I don't think it's related to anything else going on right now. I'm just making the point that a large bomb isn't necessary.
To be honest, no bomb is necessary. Just mess with the computers or pull some very important wires. Those two might be easier to fix than if you blow the thing up, but it would still achieve knocking out power and causing panic.