Sebastian Usher
Middle East regional editor
Throughout the day on Friday, Israel carried out wave upon wave of strikes on nuclear facilities and missile bases in Iran.
The Natanz uranium enrichment site and the nuclear facility in Isfahan have been hit and top military leaders have been assassinated - as have nuclear scientists.
It's a major escalation in the long-running confrontation between the two countries, which erupted into direct conflict last year.
Israeli PM Benjamin Netanyahu has been championing such an attack for years, against a foe that he regards as not just an existential threat to Israel, but to the whole world.
In one of his statements during the day on Friday, Netanyahu called on the Iranian people to stand up and achieve their freedom.
In response, Iran has launched several salvos of drones and ballistic missiles against Israel - the first in the morning was intercepted.
But later in the evening - as sirens rang out - the sky boomed and lit up over Jerusalem and other regions as the volley of missiles intensified.
In Tel Aviv, there were great swathes of smoke and explosions as people took to shelters as they'd been instructed.
Iran has shown that - however weakened it may be in comparison to a year or two ago - it can still put up a fierce response to Israel's unprecedented attack.