NYT Magazine:
By now we can too readily imagine the horror of terrorists exploding a nuclear weapon in a major American city: the gutted skyscrapers, the melted cars, the charred bodies. For Sam Nunn, however, a new terror begins the day after. That’s when the world asks whether another bomb is out there. “If a nuclear bomb went off in Moscow or New York City or Jerusalem, any number of groups would claim they have another,” Nunn told me recently. These groups would make steep demands as intelligence officials scrambled to determine which claims were real. Panic would prevail. Even after the detonation of a small, crude weapon that inflicted less damage than the bomb at Hiroshima, Nunn suggested, “the psychological damage would be incalculable. It would be a slow, step-by-step process to regain confidence. And the question will be, Why didn’t we take steps to prevent this? We will have a whole list of things we wish we’d done.”
Here.