They are claiming so, anyway. In any case, they blew up something big.
(CNN)Sticking it to its foes, North Korea on Wednesday celebrated what it called a successful hydrogen bomb test — a milestone that, if true, marks a colossal advancement for the reclusive regime and a big test for leaders worldwide on what to do about it.
“Make the world … look up to our strong nuclear country and labor party by opening the year with exciting noise of the first hydrogen bomb!” read a document signed by North Korean leader Kim Jong Un on state television.
Pyongyang has been very vocal about its nuclear ambitions, pressing on despite widespread condemnation, sanctions and other punishments. Having a hydrogen bomb — a device far more powerful than the plutonium weapons that North Korea has used in three earlier underground nuclear tests — ups the ante even more.