Iran’s investigation into the May helicopter crash that killed president Ebrahim Raisi has found it was caused by bad weather, Iranian media said Wednesday citing an official. The helicopter carrying 63-year-old Raisi and his entourage came down on a fog-shrouded mountainside in northern Iran, killing the president and seven others, and triggering snap elections. Fars news agency, quoting an informed security source with knowledge of the conclusions of the probe, said overloading was also behind crash, which the Armed Forces swiftly rejected as “completely false”. The source quoted by Fars sai…