Israel's sweeping attack across Iran struck at the heart of Tehran's nuclear program, delivering a blow to the country's ability to enrich uranium and potentially setting its nuclear ambitions back by months or years.

Israel badly damaged one of Iran’s key nuclear sites and killed a startling array of top military and nuclear officials in the attacks that started on Friday morning. But when the sun rose after that devastating assault, it was also clear how much of Iran’s nuclear program remained, at least for now.

Iran retaliated by launching waves of drones and ballistic missiles at Israel, where explosions lit the night skies over Jerusalem and Tel Aviv and shook the buildings below. The Israeli military urged civilians, already rattled by 20 months of war sparked by Hamas’ Oct. 7 attack, to head to shelter for hours.