For years now, experts around the world have been talking about the site of a potential North Korean uranium enrichment plant referred to as Kangson, but open-source analysis has yet to prove it.

Now, the small industrial site near Pyongyang is showing activity “relevant” to the country’s nuclear program, the International Atomic Energy Agency (IAEA) said on Wednesday, adding credence to a leading theory on the nuclear site’s location.

Speaking at the agency’s Board of Governors meeting on Nov. 18, Director Rafael Mariano Grossi made the IAEA’s strongest suggestion yet about the Kangson site.

“We are trying to fine-tune