ran’s Supreme Leader Ayatollah Ali Khamenei has announced five days of mourning, following the death of the country’s president in a helicopter crash.br br Ebrahim Raisi, along with Foreign Minister Hossein Amir-Abdollahian and six other people, were killed when the helicopter they were travelling in crashed in a mountainous area of north-western Iran.br br Ayatollah Khamenei said he offered his condolences "to the dear people of Iran".br br Vice-President Mohammad Mokhber has been appointed to assume interim duties after the death of the president, and he will also work to prepare for a presidential election within 50 days - a period of time set out in Iran's constitution for replacing a president who dies in office.