Search and rescue teams are continuing to search for an Iranian plane that crashed in bad weather on Sunday.
In a press statement, IRCS spokesman Ramezan Sharif confirmed that helicopters had spotted the wreckage of the ill-fated plane.
The Iran Aseman Airlines plane took off from the capital Tehran at 8:00 a.m. local time (0430 GMT) on Sunday and disappeared from the radar screen 50 minutes later in an area which is about 22.4 km from its destination Yasuj city.
The airplane was carrying 60 passengers, in addition to the crew that consisted of a pilot, co-pilot, two flight attendants, and two security officers, the source added.
Mohammad Taghi Tabatabai, an Aseman Airlines spokesman stated state TV that all passengers on Flight No. EP3704 were killed.
Boeing, which is also building 80 planes for national carrier Iran Air, faces heavy criticism from U.S. lawmakers who say Iranian airlines have been used to ship weapons and troops to Syria and other conflict zones.
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We were in at full-time asking how he is, for me especially when I was that age, I've never seen anything like that. You have to try and compete with them at this level. "Now we have the right confidence again", said Conte.
More than 120 mountaineers are deployed, he said, and "will stay in safe places in the mountainous area before resuming search operations tomorrow".
The plane's debris was found near the peak of Dena Mountain in southern Isfahan province, into which the plane has crashed.
It was one of only three airlines barred over safety concerns - the other 190 being blacklisted due to broader concerns over oversight in their respective countries.
Decades of worldwide sanctions have left Iran with an ageing fleet of passenger planes which it has struggled to maintain and modernise.
Though the 2015 nuclear deal lifted some of those sanctions, many older planes are still in service. Chicago-based Boeing also signed a $3 billion deal that month to sell 30 737 MAX aircraft to Aseman Airlines.
And all over again in July 1988, the USS Vincennes in the Strait of Hormuz confused an Iran Air flight heading to Dubai for an attacking fighter jet, shooting down the plane and killing all 290 passengers onboard.