Iran and Israel continued on Sunday their aerial attacks, which began Friday with a series of Israeli strikes on Iran.

The retaliatory strikes came on Saturday, a day after Israel killed top Iranian military leaders and scientists and destroyed an aboveground nuclear enrichment plant near Natanz.

It follows daytime attacks from both sides, with Israeli strikes in Tehran continuing and Iran firing more missiles towards Israel.

Israel says Iran is targeting civilians, killing 8 people, as the Israeli military hammers Iranian launch sites and says it controls Tehran's skies.

Iran fired missiles at Jerusalem and Tel Aviv in retaliation, with Israel's Iron Dome intercepting attacks. Israel struck Iran's its nuclear program and military sites earlier Friday.

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.

Hundreds of civilians, mostly in Iran, have been killed by dueling airstrikes despite international pleas for de-escalation.

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

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.