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Iran's Press TV is reporting that search and rescue teams have reached the site of the plane crash that authorities say killed all 65 people on board.

The Aseman Airlines ATR-72, a twin-engine turboprop used for short-distance regional flying, went down on Sunday in foggy weather, crashing into Mount Dena in southern Iran.

The TV says search teams reached the crash site before dawn on Monday. The station said the weather had improved and broadcast footage of a helicopter joining the search.

Aseman Airlines said all on board Flight EP3704 were killed, including six crew members.

The crash was yet another fatal aviation disaster for Iran, which for years was barred from buying necessary airplane parts due to Western sanctions over its contested nuclear program.