What happens if Kim attacks? 5 things to know about North Korea

WASHINGTON —  North Korea tested a hydrogen bomb on Sunday, raising fears that Pyongyang is getting close to constructing a nuclear-tipped missile that could reach the US. The weapon was the most powerful North Korea has tested to date, with separate estimates putting the explosive yield at 50 or 120 kilotons. To put that in context, the nuclear bomb dropped on Hiroshima in 1945 — which instantly killed 80,000 people — created a yield of 15 kilotons. Here’s what you