North Korea threatens to 'reduce the US to ashes' and 'sink Japan into the sea' as satellite images suggest Kim Jong-un is preparing another nuclear test

North Korea issued the threat as satellite images of the Punggye-ri nuclear test site (pictured) suggested new areas are being prepared for future tests, despite the latest round of UN sanctions. While the northern end of the site appears to have collapsed due to the power of the last explosion,
analysts said, increased activity around the western and southern entrances suggests they are being prepared for future use. North Korea's threat to nuke Japan and the US came as defense officials said the regime has spent the last 48 hours moving mobile missile launchers and preparing 'hard sites
' to carry out a launch.