Authorities in Iran have postponed the funeral ceremony for the late Supreme Leader, Ayatollah Ali Khamenei, as US and Israeli forces continue intense strikes across the country.

An official said there had been many requests from people wanting to attend the three-day event at a Tehran prayer complex and that infrastructure needed to be prepared. It had been due to begin on Wednesday night.

A member of the Assembly of Experts meanwhile said the clerical body was "close" to choosing a successor to Khamenei, who was killed in a strike at the start of the US and Israeli assault on Saturday.

Iran has responded by launching missiles and drones at Israel and Gulf states with US bases.

Kuwait's health ministry said overnight that a girl had been killed by shrapnel that fell on a residential area during an Iranian attack.