Ebrahim Raisi, who died aged 63, rose through Iran's theocracy from hardline prosecutor to uncompromising president, overseeing a crackdown on protests at home and pushing hard in nuclear talks with world powers as he burnished his credentials to position himself to become the next supreme leader

The civilian version of the ubiquitous Vietnam War-era UH-1N "Twin Huey," they are in wide use globally by both governments and private operators

China said on Monday it was "deeply concerned" after Iranian President Ebrahim Raisi's helicopter went missing in what Tehran's state media described as an accident, and pledged to help the rescue operation

President Raisi, the foreign minister and all the passengers in the helicopter were killed in the crash, senior Iranian official told Reuters

Rescuers in Iran were racing on Sunday to find the crash site of a helicopter that was carrying President Ebrahim Raisi to find out the fate of all those on board. Below is brief outline of what Iran's constitution says happens if a president is incapacitated or dies in office