SEOUL (THE KOREA HERALD/ASIA NEWS NETWORK) - Signs of activity have recently been detected at some North Korean nuclear facilities, the United Nations nuclear watchdog chief has said, expressing serious concern at the reclusive regime's continued activities. Mr Rafael Grossi, director-general of the International Atomic Energy Agency (IAEA), told the board of governors that there was evidence that the regime has continued construction at an experimental light-water reactor at its main Yongbyon nuclear complex, including testing of the infrastructure for cooling water in late 2020. He added that while there were no signs of producing enriched uranium at the reported...