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 Israeli army says 200 jets struck more than 100 sites across Iran in a large-scale attack. Israel’s military says it launched a wave of strikes on Iran, hitting key nuclear facilities and killing senior Iranian commanders and nuclear scientists in a major attack.

After decades of threats, Israel launched an audacious attack on Iran, targeting its nuclear sites, scientists and military leaders. Here’s what to know about its controversial nuclear program.