The Israeli military said Monday that it can now fly over the country's capital, Tehran, without facing major resistance after crippling Iran’s air defenses in recent strikes, enabling Israel to hit an expanding range of targets with relative ease.

Smoke and flames filled the sky over Tehran as Israel struck oil and gas facilities in the Iranian capital and targeted more nuclear facilities during attacks that carried on into Sunday after starting two days earlier.

Salami was killed in the first Israeli strikes, along with other key commanders. Although Iran replaced the commanders quickly, it took hours for it to get its ballistic missiles ready for launch. Over the last four days, Iran has much of its missile arsenal and the launchers needed to fire them.

Israel says it first bombed Iran to stop it from being able to produce nuclear weapons and the “existential threat” they would represent.

President Donald Trump threatened Iran's supreme leader with assassination as he pushed Tehran to end its retaliatory airstrikes on Israel.