An official investigation into the helicopter crash that killed Iran's President Ebrahim Raisi and seven others in May concluded that challenging climatic and atmospheric conditions were the primary causes. The Supreme Board of the General Staff of the Armed Forces cited complex weather conditions, including the sudden emergence of thick fog, as the main factors leading to the crash. The report found no evidence of sabotage or criminal activity. The crash occurred in a mountainous area near the Azerbaijan border, and the harsh weather conditions at the site impeded rescue operations. Initial reports suggested the presence of extra passengers against security protocols, but these claims were refuted by Iranian armed forces.