North Korea has reportedly relaunched its Yongbyon nuclear power plant, the United Nations International Atomic Energy Agency has said.
Plutonium, which is responsible for developing nuclear weapons, is believed to be produced in those plants.
The Atomic Energy Agency (IAEA) was expelled by the Pyongyang government in 2009 but has been relying on satellite imagery to make an assessment.
Observers have said the plant has been providing cold water since July, suggesting it was operating.
The Yongbyon mill, with a 5-megawatt-point plant, is located at the heart of North Korea's nuclear program.
This was the first sign of operational activity at the mill since December 2018, months after US President Donald Trump met with Kim Jong-un in Singapore, according to the IAEA.
Yongbyon has long been tracked from afar by experts trying to figure out how many weapons the regime has the ability to manufacture.
