According to second report, there was no technical problem in communication system 69 seconds before the accident moreover, no emergency had reported  during the communication.

Iran's second  preliminary report on helicopter crash

After more than a week of Iran's President Ebrahim Raisi death, a second preliminary report has been published by Iran on Wednesday.

The first preliminary and shocking report was published by Iran's armed forces on Friday, raising several questions. The first report claims that there was no sign of attack adding that more inquiry is required to make a conclusive report.

The second preliminary report found no evidence of sabotage or electronic warfare intervention.

According to second report, there was no technical problem in communication system 69 seconds before the accident moreover, no emergency had reported  during the communication.

Iranian General staff said that the investigations will continue until the real reason of accident is found.