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

Israel’s leader and President Trump appeared to bet they can persevere, but other world leaders warned of unintended outcomes in a volatile region.

Last night, the government of Israel decided to roll the dice on a military solution to Iran’s decades-long pursuit of a nuclear weapons capability. Given the remarkable capabilities of the Israel Defense Forces, the operation could do tremendous damage to the Iranian nuclear program. But then comes the hard part.

Israel launched blistering attacks on the heart of Iran's nuclear and military structure Friday, deploying warplanes and drones previously smuggled into the country to assault key facilities and kill top generals and scientists -- attacks it said were necessary before the country got any closer to building a nuclear weapon.

Iran warns of an "unprecedented" retaliation if Israel attacks, while President Trump describes the Middle East as a "dangerous place."

Israel’s attack on Iran was long in the making – the result of years of meticulous planning by Israel and days of high-stakes talks between Tel Aviv and Washington, officials told CNN.

UK-IRAN-NUCLEAR-SECURITY-OFFICIAL:Iran plans to 'give a harsh response' to Israeli attack, Iranian security source to Reuters

Tensions are soaring between Iran and Israel after the Israeli strikes on Tehran, and Iran's people have vowed retaliation following a series of messages