The International Atomic Energy Agency declared Iran was in breach of its Nuclear Non-Proliferation Treaty obligations by failing cooperate with an probe into undeclared nuclear material and activities at multiple sites.

The major step is the culmination of several festering stand-offs between the International Atomic Energy Agency and Iran.

International Atomic Energy Agency says there's no increase in off-site radiation levels so far and it's in close contact with Iran to assess broader implications for nuclear safety.