Israel has launched blistering attacks on the heart of Iran’s nuclear and military structure, deploying warplanes and drones previously smuggled into the country to assault key facilities and kill top

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.

Israel says preemptive airstrikes against Iran's nuclear sites are underway, and it is bracing to intercept a wave of drones launched by Iran in retaliation.