The U.S. says it wasn't involved in the strikes on Iran, but three American officials told NBC News the U.S. is assisting in shooting down Iranian missiles and projectiles targeting Israel.

Iran launched retaliatory strikes on Israel after Netanyahu said Israel began an operation to push back on Iran's "threat to Israel's very survival."

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