Israel attacked Iran's capital early Friday in strikes that targeted the country's nuclear program and killed at least two top military officers, raising the potential for an all-out war between the two bitter Middle East adversaries. It appeared to be the most significant attack Iran has faced since its 1980s war with Iraq.

The strikes came amid simmering tensions over Iran's rapidly advancing nuclear program and appeared certain to trigger a reprisal, with Supreme Leader Ayatollah Ali Khamenei warning that "severe punishment" would be directed at Israel. Hours later, Israel's military said it had begun intercepting Iranian drones launched in retaliation.