'No sign of life' at crash site of helicopter carrying Iran's president - state TV

- Iran state TV says there is "no sign of life" at the crash site of a helicopter that was carrying President Ebrahim Raisi and Iranian Foreign Minister Hossein Amir-Abdollahian
- Reports say the helicopter - one of three travelling in a convoy - made a "hard landing" on Sunday after it got into difficulties in heavy fog in the north of the country
- Raisi was heading to the city of Tabriz, in the north west of Iran, after returning from an Iran-Azerbaijan border area, according to local media
- The incident sparked a massive search operation that was hampered by bad weather conditions
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