Placards calling for the deaths of US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu have emerged during the state funeral of Ayatollah Ali Khamenei, thrusting the solemn ceremony into the centre of an already volatile geopolitical crisis.
The signs, carried by some mourners during the funeral procession through Tehran, have renewed attention on Khamenei's revenge threats at a time when US officials continue to monitor potential threats linked to Iran.
