(NEWSER) – A tense 2016 lies ahead on the Korean Peninsula after a North Korean nuclear test that could mark an alarming leap forward in the country's technology.

Pyongyang claims that it successfully detonated a hydrogen bomb for the first time, though experts say the Wednesday morning explosion— believed to have caused a 5.1-magnitude quake—was closer in size to North Korea's three previous nuclear tests than to a hydrogen bomb explosion, reports the Washington Post. Kim Jong Un claimed last month that the country had an H-bomb, a weapon much more powerful and harder to make than an atomic bomb, and a confirmed test would almost certainly lead to tough new sanctions against North Korea, the AP reports.

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