Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

Before Israel launched a wave of strikes against Iran’s nuclear facilities and top military leaders this week, its spies were already on the ground in enemy territory.

Israel’s historic strike on Iran revealed years of Mossad activity inside the country, including hidden weapons, drones and assassinations of nuclear officials.

Israel and Iran opened a new chapter in their long history of conflict when Israel launched a major attack with strikes early Friday that set off explosions in the Iranian capital of Tehran.

The decision comes as officials say they believe that Israel is preparing to launch a military attack on Iran. Tehran condemned the vote.

Rising tensions over Iran's nuclear program have escalated amid diplomatic breakdowns, military preparations, and threats of conflict across the Middle East.