TEHRAN — An Iranian commercial airliner brought back into service only months ago after being grounded for seven years crashed Sunday in a foggy, mountainous region of southern Iran, and officials said they feared all 65 people on board were killed.
The crash of the Aseman Airlines ATR-72 marks yet another fatal aviation disaster for Iran, which for years was barred from buying airplane parts for needed maintenance because of Western sanctions over its nuclear program.
Its nuclear accord with world powers allows it to get those parts and the country has made deals worth tens of billions of dollars for new aircraft. However, President Trump’s refusal to recertify the deal has injected uncertainty into those sales while Iranians still fly in aging aircraft.
The ATR-72, a twin-engine turboprop used for short-distance regional flying, went down near its destination, the city of Yasuj, some 485 miles south of the capital, Tehran, where it took off.
It wasn’t immediately clear what caused the crash, although weather was severe in the area. Dense fog, high winds, and heavy snow in the Zagros Mountains made it impossible for rescue crews in helicopters to reach the site Sunday, state television reported.
Aseman Airlines spokesman Mohammad Taghi Tabatabai told state TV that all on board Flight No. EP3704 were killed. They included 59 passengers and six crew members, the state-run IRNA news agency reported.
‘‘After searching the area, we learned that unfortunately . . . our dear passengers had lost their lives,’’ Tabatabai said.
Both Supreme Leader Ayatollah Ali Khamenei and President Hassan Rouhani offered their condolences.
Tabatabai said the plane crashed into Mount Dena, which is about 14,400 feet tall. The plane was at 16,975 feet and descending, according to airplane-tracking website FlightRadar24.
The pilot was in contact with the tower 14 miles from the airport, state TV said.
One previous passenger on the route posted a video Sunday showing that the flight typically comes in just over the mountain peaks. Aeronautical charts for the airport warn pilots to keep an altitude of 15,000 feet in the area. The airport itself is at nearly 6,000 feet.
The Iranian Red Crescent deployed to the area. Residents described hearing the crash, according to state TV.
Aseman Airlines, owned by Iran’s civil service pension foundation, is a semiprivate air carrier headquartered in Tehran that specializes in flights to remote airfields across the country. It also flies internationally.
Aseman Airlines is Iran’s third-largest airline by fleet size, behind state carrier Iran Air and Mahan Air. However, it is banned from flying in the European Union over safety concerns.
The carrier has a fleet of 29 aircraft, including six ATR aircraft, according to FlightRadar24. The ATR-72 that crashed Sunday had been built in 1993, Aseman Airlines CEO Ali Abedzadeh told state TV.
On Instagram, Aseman Airlines highlighted the doomed aircraft in October, saying it had been grounded for seven years but would be repaired and will be operational after testing.’
European airplane manufacturer ATR, a France-based partnership of Airbus and Italy’s Leonardo SpA., said it had no immediate information about the crash.
Aseman Airlines has suffered other major crashes with fatalities.
In October 1994, a twin-propeller Fokker F-28 1000 commuter plane operated by the airline crashed near Natanz, 180 miles south of Tehran, also killing 66 people on board.
An Aseman Airlines chartered flight in August 2008, flown by an Itek Air Boeing 737, crashed in Kyrgyzstan, killing 74 people.
The last major crash in Iran happened in January 2011, when an Iran Air Boeing 727 broke to pieces on impact while trying an emergency landing in a snowstorm in northwestern Iran, killing at least 77 people.
In July 2009, a Russian-made jetliner crashed in northwestern Iran shortly after taking off from Tehran, killing all 168 on board.
