What Could a North Korean Electromagnetic Pulse Attack Do to the United States?

What Could a North Korean Electromagnetic Pulse Attack Do to the United States?
This photo taken on February 12, 2017 and released on February 13 by North Korea's official Korean Central News Agency (KCNA) shows the launch of a surface-to-surface medium long-range ballistic missile Pukguksong-2 at an undisclosed location. STR/AFP/Getty Images
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North Korea has started to threaten the United States not just with a nuclear strike, but with a potentially devastating electromagnetic pulse (EMP) attack.

In its sixth nuclear test on Sept. 10, North Korea claimed it detonated a hydrogen bomb. This H-bomb, according to a statement issued by the regime, “is a multi-functional thermonuclear nuke with great destructive power which can be detonated even at high altitudes for super-powerful EMP (electromagnetic pulse) attack according to strategic goals,” reported AP.