DUBAI, May 19 (Reuters) - A helicopter carrying Iranian President Ebrahim Raisi and his foreign minister crashed on Sunday as it was crossing mountain terrain in heavy fog, an Iranian official told Reuters, and rescuers were struggling to reach the site of the incident.

The official said the lives of Raisi and Foreign Minister Hossein Amirabdollahian were “at risk following the helicopter crash”, which happened on the way back from a visit to the border with Azerbaijan in Iran’s northwest.