President Ebrahim Raisi was buried in his hometown of Mashhad on Thursday, four days after his helicopter crashed while returning from a ceremony to inaugurate a dam on the border with Azerbaijan.
The decades-old American-made Bell 212 aircraft was flying toward the northwestern city of Tabriz in heavy rain when it crashed into a mountainside.
“Nothing suspicious was found in the conversation between the control tower and the flight crew,” the preliminary report said.
He added, “No traces of gunshot wounds were found in the wreckage.”
The aircraft was discovered by a drone on Monday, but rescue teams' work was hampered by “complexity of the area, fog and low temperatures,” according to the report.
A military broadcast on Thursday said in a statement that the final communication from the president's helicopter was recorded about 90 seconds before the crash.
The 63-year-old president was traveling with Foreign Minister Amir Abdoulaan, three other officials and three helicopter crew members. There were no survivors.
Tehran announced five days of mourning. Tens of thousands of people took part in the funeral procession.
Raisi, a hard-line cleric, was seen as a potential successor to Iran's Supreme Leader Ayatollah Ali Khamenei.
Acting President Mohammad Mokhber will remain in office until elections are held on June 28.
