Iran lashed out at the US for crossing “a very big red line” with its risky decision to launch strikes on three Iranian nuclear sites.

The move, the first time the U.S. has attacked Iran, is a major escalation of the conflict between Israel and Iran.

The United States joined Israel’s campaign against Iran’s nuclear program in a bid to stymie it. A clear picture of the damage inside Iran—and the state of its nuclear strength—is still unfolding.