Supreme leader Ayatollah Ali Khamenei, who has ultimate authority in Iran, declared five days of national mourning and assigned vice president Mohammad Mokhber, 68, to assume interim duties ahead of elections.
State media later announced the presidential election would be held on June 28.
Iran’s top nuclear negotiator Ali Bagheri, who served as deputy to Amir-Abdollahian, was tapped to serve as the acting foreign minister.
After leaving Tabriz, Raisi’s body will arrive in Iran’s Shia clerical centre of Qom on Tuesday before being moved to Tehran.
Khamenei is due to hold prayers at a farewell ceremony in Tehran on Tuesday night, ahead of major processions due to begin on Wednesday morning.
Raisi will then be taken to Southern Khorasan province on Thursday morning and later to his hometown of Mashhad, where he will be buried on Thursday evening after funerary rites.
Raisi, 63, had been in office since 2021, a time during which Iran was rocked by mass protests, an economic crisis deepened by US sanctions, and armed exchanges with arch-enemy Israel.
Raisi succeeded the moderate Hassan Rouhani, at a time when the economy was battered by US sanctions over Iran’s contested nuclear programme.
Condolences flooded in from Palestinian militant group Hamas, Lebanon’s Hezbollah, and Syria, all members of the so-called “axis of resistance” against Israel and its allies, at a time of high Middle East tensions over the Gaza onslaught.
The offensive in the Palestinian territory sent tensions soaring and a series of escalations led to Tehran launching hundreds of missiles and drones at Israel in April.
It came in response to an earlier air strike widely blamed on Israel that levelled Tehran’s Damascus consulate and killed two Revolutionary Guards generals.
In a speech hours before his death, Raisi emphasised Iran’s support for the Palestinians, a centrepiece of its foreign policy since the 1979 Islamic revolution.
Palestinian flags were raised along with the Iranian flags in ceremonies for Raisi across the Islamic republic on Monday.
