How North Korea could wipe out electrical networks across the US with a high-altitude EMP blast

North Korea’s latest nuclear weapons test has renewed fears of a devastating electro-magnetic pulse, or EMP, attack that could wipe out electrical grids across the US.

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.

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