With President Obama arriving in Seoul this Friday, North Korea is showing signs of preparing for a fourth nuclear test.
South Korean Defense Ministry spokesperson Kim Min-seok said Tuesday, that increased movement has been detected at the North's Punggye-ri nuclear test site.
He added that Pyongyang is at a stage where it could carry out a nuclear test at anytime.
South Korea and U.S. forces are closely monitoring the situation, and the South's defense ministry and the Joint Chiefs of Staff have also set up a crisis management task force to prepare for a possible test.
Experts have speculated recently that a fourth nuclear test could be in the works.. ahead of Obama's visit to Toyko and Seoul this week.