Nuclear security

U.N. atomic agency: North Korea nuclear weapons 'extremely worrying'

The United Nations atomic agency director said Tuesday signs North Korea has not slowed down its nuclear weapons program is of grave concern to the international community.

The statement from the International Atomic Energy Agency came the same day U.S. analysts said the latest satellite images show a "resumption of activity" at the country's Punggye-ri nuclear test site.

IAEA Director General Yukiya Amano told the Preparatory Committee for the 2020 Review Conference on the Treaty on the Non-Proliferation of Nuclear Weapons that concerns are growing regarding North Korea's program.