Israel's ongoing airstrikes and intelligence operation and Iran's retaliation raised fears of all-out war between the countries and propelled the region, already on edge, into even greater upheaval.

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 — a barrage it said was necessary before its adversary got any closer to building an atomic weapon.