North Korea test hydrogen bomb Japan, S Korea vow tough response it

North Korea announced on Wednesday it had successfully carried out its first hydrogen bomb test, a development that, if confirmed, would mark a stunning step forward in its nuclear development.
00am on January 6, 2016, based on the strategic determination of the Workers' Party," a state television news reader announced.
Meanwhile, the US vowed to respond appropriately to North Korea's provocations after the reclusive nation claimed that it had carried out a hydrogen bomb test.
The underground explosion angered China, which was not given prior notice although it is North Korea's main ally, pointing to a strain in ties between the neighbours.