Emergency services say ten have been killed in Israel, while Iranian state media have given little information about casualties in Iran.

Iran's Islamic Revolution Guards Corps (IRGC) launched late Saturday night a "large-scale combined offensive operation" against Israel, involving a significant number of missiles and drones, the IRGC's official news outlet Sepah News reported.

Iran is planning to 'give a harsh response' to an Israeli attack launched early on Friday against its nuclear programme, an Iranian security source told Reuters.

"Our support for Gaza and our defense of our country against the Zionist aggression against it has continued," a Houthi source told Newsweek.

In all, at least 20 senior commanders were killed, two regional sources said. The head of the Revolutionary Guards aerospace force was also reported to be among them.