Do these satellite images prove Kim Jong-un IS preparing to detonate a new nuclear bomb to mark North Korea's 'Day of the Sun'?

Do these satellite images prove Kim Jong-un IS preparing to detonate a new nuclear bomb to mark North Korea's 'Day of the Sun'?

Satellite images (main) taken yesterday show continued activity at the Punggye-ri Nuclear site in North Korea where US officials fear a nuclear device has been installed in a tunnel ahead of another test. There have been reports of 'unusually high levels of activity' at the facility over the past four weeks. North Korea's most important national day is on Saturday April 15 when the country commemorates the birth anniversary of its founding president Kim Il Sung. Ahead of the event, Kim Jong-un (right, at a military training exercise yesterday) oversaw a commando operation in which special forces dropped from light transport planes 'like hail' and 'mercilessly blew up enemy targets'. Japanese Prime Minister Shinzo Abe today warned his parliament Pyongyang could have the capacity to deliver missiles equipped with sarin nerve gas while China said it would step up its protection of North Korea should the isolated state halt its nuclear programme.