Expert provides insight into suspected cause of helicopter crash that killed Iran's president

Iranian President Ebrahim Raisi, Foreign Minister Hossein Amirabdollahian, and other officials died in a helicopter crash Sunday near Iran's northern border with Azerbaijan, Iranian state media said Monday morning.

The helicopter was part of a convoy of three helicopters returning from an event inaugurating a joint dam project when it crashed in heavy fog in a remote area on Sunday. The fog and rugged terrain hindered search operations. All eight bodies on board were found on Monday.

Raisi's death comes during heightened international tensions and increased speculation over who will eventually replace Iran's Supreme Leader Ayatollah Ali Khamenei. Raisi was widely considered a potential successor.GANYARD: It seems to be a fairly classic mishap that occurs when helicopter pilots try to skirt underneath weather in very mountainous terrain. So we know that there was a lot of fog in the area. We know that they had dignitaries, very important people, which oftentimes puts an extra, at least mental burden on the pilots to make sure that they get to get to the destination. And when you're flying in the mountains and you have very low visibility, there's a natural tendency for helicopter pilots to begin to sort of descend and try to get lower and try to get underneath either the fog or the cloud layer. And they know that they can set the aircraft down if they need to. But oftentimes it leads to tragedy. If you remember, earlier this year, back in February, a marine Corps helicopter was trying to do this very thing, trying to get back to San Diego and in the mountains above San Diego, just to the to the east of San Diego, crashed. And unfortunately, all the Marines on board lost their lives.

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