North Korea claims to have hydrogen bomb—threatens to knock out U.S. electrical grid

North Korea said it has “succeeded in making a more developed” hydrogen bomb and mounting it on the tip of a long-range missile, and threatened a high-altitude nuclear blast that experts fear could wipe out electrical networks in the U.S. Leader Kim Jong Un witnessed a hydrogen bomb being mounted...

North Korea claims to have hydrogen bomb—threatens to knock out U.S. electrical grid