VIENNA -?The UN nuclear agency on Monday said the Democratic People's Republic of Korea (DPRK) is carrying out renovation and construction activities at its Yongbyon site.

"We have observed renovation and construction activities at various locations within the site," International Atomic Energy Agency (IAEA) Director General Yukiya Amano told a board meeting in Vienna.

"These appear to be broadly consistent with the DPRK's statements that it is further developing its nuclear capabilities, " Amano said.

However, the DPRK is not a member state of the UN nuclear agency, and it has publicly announced it is developing nuclear weapons. UN nuclear inspectors have not been in the DPRK for years.

"The agency remains unable to undertake verification in the DPRK and our knowledge of the country's nuclear program is limited," the IAEA chief said.