Iranian authorities say they anticipate between 15 and 20 million participants in the capital alone over the next three days for tributes to the late supreme leader Ali Khamenei, who ran the country for 36 years.

Iran is preparing the largest state funeral in its history for former Supreme Leader Ayatollah Ali Khamenei, who was killed in a US-Israeli strike on 28 February.

Huge scale of funeral across five cities is intended to relay message of resistance to rest of the world