North Korea has been seen positioning vehicles at Sunan International Airport, located in its capital city of Pyeongyang the same place where the North attempted to test its new ICBM "Hwasong-17" on Wednesday but failed.
South Korea's military reportedly said the missile exploded at some point below an altitude of 20 kilometers.
Citing a commercial satellite image, 38 North a research program at a Washington-based think tank said that just a day after the launch, the regime positioned around 50 vehicles at both parallel runways at the Sunan airport and in the airfield in between.
It said the presence of so many vehicles is unusual, and that this likely involves clean-up efforts.
Also on Friday, Voice of America news reported that the North is showing signs of preparing for a military parade.
It said a satellite image taken on Wednesday shows troops at the parade training ground of Mirim airport in Pyeongyang.
It added that the number of troops is estimated to be at least one-thousand, and could reach as many as 6-thousand.
Over the last several years, training usually began one to several months ahead of the event.
All eyes are on whether the North will hold a large-scale military parade next month, on April 15th, to mark the 110th anniversary of the birth of its founder Kim Il-sung.
Meanwhile, there have also been reports that North Korea has started removing a hotel built by South Korea at Mount Kumgang that was once a symbol of inter-Korean reconciliation.
When asked about it, the unification ministry said Friday that the government has been closely monitoring the situation, but said it's too early to jump to any conclusions.
"Our government has been taking a firm stance and that North Korea should not take any measures that could infringe the property rights of South Korean companies and that all issues should be resolved through negotiations between the two Koreas."
The spokesperson added that the government will continue to review measures needed to resolve the situation such as through the joint liaison office.
Bae Eun-ji, Arirang News.