Several sources are now saying it was an emergency landing of just one of the three helicopters in the convoy. It is not know if the one transporting Raisi was involved.

FarsNews is saying it was his helicopter, they had an emergency landing in the fog, but he is safe and is travelling by land now.

Tasnim News on Twitter: Since the accident was reported, rescue teams from the Red Crescent, as well as military and law enforcement, have launched an extensive search for the president's helicopter.
According to local residents, the helicopter's status remains unknown due to the foggy conditions in the area.
Given the phone call made by one of the president's companions to central headquarters following the accident, there is a considerable hope that there were no casualties.

Military exercises of NATO countries and their Middle Eastern allies are taking place on the territory of Jordan ; 33 countries are participating in them, including Saudi Arabia , UAE , Egypt , Iraq , Morocco and Lebanon

[RT]

According to the Iranian news agency IRNA, the helicopter's passengers were:

❗️ Iran's President Ibrahim Raisi
❗️Foreign Minister Hossein Amir Abdollahiyan
❗️ Ayatollah Al-Hashemi, Imam of Tabriz Mosque
❗️Governor of East Azerbaijan Province Malik Rahmati