State news agency IRNA said Raisi was flying in a U.S.-made Bell 212 helicopter.
The final investigation report on the helicopter crash in which Iran's late President Ebrahim Raisi was killed shows it was primarily caused by weather conditions that included thick fog.
The main reason of the helicopter crash was complicated weather conditions in the region," according to the final report as revealed by Iran's state TV.
The report issued by a high committee charged by Iran's military with investigating the incident said a thick mass of fog caused the helicopter that was carrying Raisi and his companions to crash into the mountain.
A preliminary report by Iran's military said in May that no evidence of foul play or an attack had been found during the investigation, Reuters reports.
Iranian President Ebrahim Raisi was killed in a helicopter crash in mountainous terrain near the Azerbaijan border.
The leader was a hardliner long seen as a potential successor to Supreme Leader Ayatollah Ali Khamenei.
The charred wreckage of the helicopter which crashed carrying Raisi and Foreign Minister Hossein Amirabdollahian was found after an overnight search in blizzard conditions.
Raisi's death was later confirmed in a statement on social media by Vice President Mohsen Mansouri and on state television.
State TV reported that images from the site showed the aircraft slammed into a mountain peak, although there was no official word on the cause of the crash.
State news agency IRNA said Raisi was flying in a U.S.-made Bell 212 helicopter.