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.

Revolutionary Guards Commander Hossein Salami reported killed. Fears of war rise as nuclear talks stall. See Iranian facilities before and after.

The simultaneous strikes represented the latest salvo since a surprise attack by Israel two days earlier aimed at decimating Tehran’s rapidly

Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

Israel warned hundreds of thousands of Tehran residents to evacuate a central district of the Iranian capital Monday, as the assault it began last week continued for a fourth day. Iranian strikes also targeted Tel Aviv and other cities.

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.