Different scenario. An EMP wouldn't necessarily be from a physical nuclear attack creating wide spread devastation. It could be caused by an atmospheric event which might be an intentional nuclear detonation above the surface. or a comet, massive solar flare, asteroid impacting the atmosphere, etc., etc.

There, now don't you feel better?

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now