At least 35 people have been killed in a stampede as Iranians flocked to the burial of a top commander killed in a US drone strike, Iranian media report.
The deaths led to the postponement of Qasem Soleimani's burial. A new time will be announced later, officials say.
Soleimani is being laid to rest in his hometown of Kerman with millions already estimated to have packed the streets for funeral processions.
His killing has raised fears of a conflict between the US and Iran.
Soleimani was widely considered the second most powerful man in Iran behind Supreme Leader Khamenei. The US saw him as a terrorist and a threat to American troops.
President Trump adopted a tough stance against Iran after his election and Tehran responded with their own campaign. Tensions were raised further last month after the US attacked an Iranian-backed militia in Iraq it blamed for attacks on US forces.
It is unclear what caused the stampede in Kerman, south-eastern Iran, but vast numbers of people were in the streets ahead of Soleimani's planned burial.