Images of Kim Jong Un visiting an uranium plant in state media did not show its location. Analysts say that the images are very similar to one particular site in Pyongyang.

North Korea has accidentally revealed the location of their secret site to build nuclear bombs after releasing photos of Kim Jong Un taking a tour at a uranium-enrichment facility.

Images posted by a state news agency online offer a rare look into the nuclear weapons development programme of this isolated nation, which has put South Korea, Japan and their allies on edge.

The photos show Kim walking through a bright and sterile facility. He is surrounded by rows of cylinder machinery that are used to create weapons-grade material nuclear for the North’s growing arsenal.

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The location of the facility was not revealed in the report that accompanied the photos on the Korean Central News Agency website.

North Korea experts and observers have determined that the photos were taken near the Kangson uranium-enrichment plant, just outside Pyongyang.

Site in Chollima-guyok to the southeast of the capital has attracted international attention for many years and it is believed that the site has been operational since early 2000.

Jeffrey Lewis, an expert in non-proliferation at Middlebury Institute of International Studies said that five images of the facility’s interior, including the “big” room and an annex matched features of satellite imagery of a nuclear site.

“That’s probably Kangson.” It’s an enrichment facility,” Mr Lewis said. He added that the odd shape of the annex and the unusual columns and beams were a “strong matching” with the new buildings that North Korea built at the site this year.

North Korea may have several sites where uranium is being enriched.

Experts who analyzed satellite imagery in recent years found that construction was underway at the main Yongbyon Nuclear Scientific Research Centre as well as the Kangson location. This indicates a potential expansion of both sites, they said.

Rafael Grossi reported in June that a new building was being built at the Kangson Complex. He noted that the Kangson complex had “similar infrastructure characteristics” to the reported centrifuge-enrichment facility in Yongbyon.

The announcement comes after the North Korean dictator announced that the country will exponentially increase their stockpiles of nuclear weapons during a surprise address on the 76th Anniversary of the Founding of North Korea. Mr Kim stated that there was no limit to the country’s expansion in terms of military power.

Shin Won Sik, the new National Security Advisor (NSA) of South Korea, warned in July that Pyongyang might be considering a nuclear test near to the US Presidential election in November.

KCNA reported Mr Kim’s tour of the facility during which he expressed his satisfaction with the technical capabilities of North Korea’s nuclear sector. He also stressed the need to “further augment the number centrifuges to exponentially increase nuclear weapons”.

Colin Zwirko is a senior analyst with NK Pro – a Seoul based website that monitors North Korea. He said the photos and satellite images indicate the complex visited was Kangson.

Experts say that the photos, which show a complex design with around 1,000 centrifuges as well as a hall with cascades interconnecting the centrifuges suggest that North Korea is making progress in its uranium-enrichment programme.

The 38 North North Korea Monitoring Programme, based in Washington, said that the size of the cascades, and the hall, indicate a substantial amount of capacity. It may not be the ‘exponential’ growth Kim demanded, but it is still a significant increase.

The report said it is possible that the centrifuges were “North Korean-designed and manufactured. However, they probably use at least some import materials despite decades’ worth of increasingly harsh sanctions”.

Experts have suggested that the timing of KCNA releasing the images coincides with the upcoming US elections. They suggest that North Korea is trying to influence American voters, and to send a signal to the next administration about the impossibility of denuclearisation.