A nuclear reactor at North Korea’s main nuclear research center at Yongbyon resumed operations in mid-October after a shutdown period, while the country continues to expand its uranium enrichment capabilities, according to the head of the U.N. nuclear watchdog.

In a statement to the International Atomic Energy Agency (IAEA) Board of Governors on Monday, Director-General Rafael Grossi stated that the agency observed the 5MW(e) reactor at Yongbyon resumed operations after a period of approximately 60 days, which it assessed to be long enough to refuel the reactor and start a new operational cycle.

Grossi added that there appear to be