North Korea says it has successfully tested a hydrogen bomb meant for an intercontinental ballistic missile
Tremors were detected in the country earlier with South Korea's military saying the quake - measuring 6-point-3 in magnitude - appeared to be man-made.
Pyongyang had announced it's developed a more advanced nuclear weapon that has 'great destructive power'.
Journalist Alex Jensen is in Seoul and says it shouldn't come as a surprise:
