TEHRAN - Iran on Wednesday ruled out the possibility of a sabotage explosion leading to the helicopter crash that resulted in the deaths of Iranian President Ebrahim Raisi and his entourage, local media reported.

The General Staff of Iran's Armed Forces released the second report on the causes of the helicopter crash on Wednesday, the official news agency IRNA reported.

The report showed given the results of the tests on the helicopter's wreckage and remaining parts and the way the remains had been scattered at the scene of the incident as well as their distance from the fuselage, the possibility of an explosion caused by an act of sabotage during the flight or moments before the chopper's crash into the mountain was dismissed.

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"Also, no signs of an act of electronic warfare was detected on the helicopter," the General Staff, which was looking into the cause of the deadly accident, said in its latest report. 

The weather conditions on the way back to Tabriz, the capital of East Azerbaijan province, would need further investigations, it added.

No sign of an act of electronic warfare was detected on the crashed helicopter, the report showed, adding that the weather conditions on the way back to Tabriz, the capital of East Azerbaijan province, would need further investigations

The General Staff said the investigation will continue until the main cause of the crash is determined and the results will be made public, according to the IRNA report. 

The investigation found that the helicopter's capacity in terms of the maximum standard load it could carry at the point of take-off, and throughout the flight path and the return route, was within the "permissible limit", according to Mehr News Agency, another Iranian media organization. 

The military investigators also ruled out any disruption in the communication system or frequency interference with the helicopter. 

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In addition, during the flight and until 69 seconds before the incident's occurrence, contact had been maintained with the crashed helicopter's flight crew on the specified frequencies, which dismisses the possibility of any disruption in the communication system or frequency interference, Mehr reported. 

The first report of the investigation committee of the General Staff of Iran's Armed Forces was released on May 23.

*With China Daily inputs