KBS said it “exclusively secured” recent satellite photos that show North Korea's reactor in Yongbyon has a diameter of 22 meters and is 40 meters high, and the outer walls of its turbine building "appear to be organized."

The North has also apparently completed construction of the outer part of a new light water reactor with a capacity of 25 to 30 megawatts in its Yongbyon complex, after first breaking ground in 2010, KBS said.

Compared to photos taken in April, the latest photos show signs that the amount of sand and earth around a newly-dug tunnel has increased.

KBS also said it had recent satellite photos of the nuclear test facility at Punggyeri but did not provide other details.

Under deals reached in 2007, the North began disabling a nuclear reactor and other facilities at Yongbyon under US supervision in exchange for economic aid and political incentives.

However, in April 2009 the reclusive communist regime expelled IAEA and U.S. nuclear specialists from the country and pulled out of talks with Russia, Japan, China, the United States and South Korea after the United Nations Security Council passed a resolution condemning North Korea's missile tests.