A satellite image of the development of a nuclear warhead has been released in Wonro-ri, Mangyeongdae-gu, Pyongyang, North Korea.

CNN Broadcasting reported that it had spotted surveillance facilities, high-rise residences, leadership visits, and underground facilities in the vicinity of Wonrori after acquiring photos captured by the private satellite company Planet Labs.

"The trucks and container-loaded vehicles were captured and the plant seems to be very active," said Jeffrey Lewis, director of the Middle East International Studies Center's East Asia Non-Proliferation Center. "It wasn't delayed."

Earlier, the facilities around the Wonrori were confirmed by the James Martin Non-Proliferation Research Center in 2015.

The CIA and the Pentagon of the United States' Central Intelligence Agency declined to express their stance on whether North Korea's nuclear program is linked to the Principles.

CNN points out that the announcement that President Trump's ``there is no longer a nuclear threat to North Korea'' in 2018 has weakened as the undisclosed North Korean nuclear facility has been unveiled.