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- A helicopter carrying Iranian President Ebrahim Raisi "crashed upon landing," state media reported.
- An Iranian official said Raisi's life was "at risk."
- Harsh weather conditions and heavy fog are complicating rescue missions.
No signs of life have been detected at the site where a helicopter carrying Iran's president crashed, CNN reported, citing Iranian state news agency IRINN.
Rescuers spotted part of the wreckage on a hillside in Iran's East Azerbaijan province early on Monday but found no survivors, CNN reported, citing the Iranian state media FARS News Agency.