A new satellite image has shown indications of new activity at a nuclear test site in North Korea.
According to the Center for Strategic and International Studies, the image acquired on Tuesday showed new construction work at Tunnel four of the Punggye-ri Nuclear Test Facility.
It also said that renovations in Tunnel three, which began around four months ago, look to be complete.
South Korea's Foreign Minister Park Jin had already stated that the regime appeared to be preparing to conduct a possible seventh nuclear test.
The facility has a total of four tunnels, which were believed to have been partially collapsed when North Korea disabled the site in 2018.