TEHRAN -- A top Iranian security official said on Sunday Iran will strike Israel and US bases in the Middle East with a force "they have never experienced before."

Secretary of Iran's Supreme National Security Council Ali Larijani made the remarks in a post on social media platform X following Iran's confirmation of the death of the country's Supreme Leader Ayatollah Ali Khamenei in a US-Israeli airstrike in Tehran on Saturday.

Larijani said, "Yesterday Iran fired missiles at the United States and Israel, and they did hurt. Today we will hit them with a force that they have never experienced before."

On Saturday morning, Israel and the United States launched joint attacks on Iran's capital Tehran and several other Iranian cities. Iran responded through missile and drone attacks targeting Israel and US bases.