WASHINGTON (Reuters) - It would be a  game-changer  if North Korea conducts a hydrogen bomb test over the Pacific and the United States is taking the threat seriously, but it does not give  too much credence  to Pyongyang taking such action, a senior U.S. official said on Friday.  There s a certain amount of bluster that s taken for granted when you re dealing with North Korea,  the Trump administration official told Reuters. The official added, however, that  we have to some extent take it seriously.  The official, speaking on condition of anonymity, said there were questions whether North Korea had the capabilities to conduct such a test but declined to specify how the United States would respond.  It would be a game-changer in some sense,  the official said.  But I don t think we should give too much credence to it at the moment.  
U.S. takes North Korea threat of H-bomb test seriously, Trump official says