Perhaps one of the most frightening terrorist-attack scenarios is one wherein a nuclear-tipped missile is launched by terrorists from a seemingly harmless cargo ship somewhere off the coast of the United States.

In such an attack, the missile could be hurtling skyward almost before our current missile-defense system had time to blink. The missile’s warhead could then be remotely detonated somewhere 20 to 60-plus miles above the visual horizon, and — in addition to killing everyone in the blast and radiation radius — trigger an electromagnetic pulse (EMP), which would basically fry every single electrical circuit in the blast’s line-of-sight for hundreds of miles in every direction. An EMP would effectively knock out all electrical grids, aircraft, trains, ships, automobiles, computers, medical equipment, ATM machines, cooling and heating systems, TVs, radios, telephones, blackberries, flashlights, electric toothbrushes, and children’s toys in an instant.

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