The roof of a luxury villa in Wonsan belonging to North Korean leader Kim Jong-un has collapsed, apparently due to faulty construction.

A comparison of a photo of the villa taken by South Korea's Arirang 3 satellite and an earlier image of the area on Google Earth shows a building in the compound with a collapsed roof.

One U.S. satellite image expert who analyzes photos of the luxury villas and government buildings used by the North Korean elite said the building appears to be an aquarium that was built in 2011.