For the first time, North Korea specifically mentioned the possibility of an EMP attack on the US following Sunday's test of a 100-kiloton weapon, which the regime claims is a thermonuclear bomb.
The weapon could wipe out much of a city, but the pulse from a high-altitude blast could sow chaos and destruction far wider.
North Korea's state news agency warned that the weapon 'is a multifunctional thermonuclear nuke with great destructive power which can be detonated even at high altitudes for super-powerful EMP attack.'
A nuclear bomb detonated 19 miles above the earth would affect Kansas and the surrounding states. One detonated at an altitude of 294 miles would affect most of the continental US. The map above shows EMP blast zones (red) of detonations at different altitudes (black numbers)