North Korea kept up its bellicose rhetoric against the United States on Monday as South Korean officials said Pyongyang may be preparing its sixth nuclear weapon test. Seoul's National Intelligence Service (NIS) told South Korean lawmakers at a closed door parliamentary session that it has detected signs of North Korea preparing for another nuclear test at its Punggye-ri underground test site. Speculation of when North Korea would conduct another nuclear test has been rife this year, with it being pegged to various days important in North Korean history.
