Meanwhile, President Donald Trump has told a White House event the US is striking Iranian drone and missile systems "every single hour".

Fighting between Israel and Hezbollah in Lebanon intensified, and countries including Azerbaijan and Saudi Arabia reported fresh attacks.

Israeli forces struck a meeting of Iran’s Supreme Council on Tuesday as officials gathered to choose a successor to the late Ayatollah Ali Khamenei, a source said.

Newsweek has created a list recording every country where a strike has been reported in the U.S.-Iran conflict.

The four US Army reserve soldiers were killed in a drone strike in Kuwait on Sunday, one day after the US and Israel began the operation.

Israel said it carried out airstrikes targeting Iran's security apparatus as both Israeli and U.S. officials hint at a regime change and popular uprising.

After meeting with the chief of staff of the French military in ⁠Beirut, Lebanon's President Joseph Aoun asked Macron to intervene to "prevent ⁠the targeting of the southern suburbs following threats by the Israeli army against its residents," the Lebanese presidency said in a separate statement.

President Donald Trump has told a White House event the US is striking Iranian drone and missile systems "every single hour".