Relatives of 66 people who were on board a plane that crashed in Iran are desperately waiting for any news, as a search operation resumed.

State television said the weather had improved after blizzard conditions hampered search efforts Sunday, and that helicopters were now able to take part in the hunt for Aseman airlines flight ep3704.

The authorities had called off the rescue effort overnight as heavy snow and rain made it impossible to work.

The Aseman airlines passenger plane came down in the Zagros mountains on Sunday, and all those on board are feared to have been killed.

The ATR 72-500 twin-engine turboprop was travelling from Tehran to the south-western city of Yasuj.

Flight ep3704 left Tehran at 04:30 gmt on Sunday, and crashed about an hour later on Dena mountain, near the city of Semirom in Isfahan province.

The crash site is about 22km from Yasuj.