Tehran: An Iranian commercial airplane crashed in southern Iran on February 19, and officials said they feared all 65 people on board were killed.

The plane was reportedly brought back into service only months ago after being grounded for seven years. It crash occurred at a foggy, mountainous region.

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 due to Western sanctions over its contested nuclear program.

The ATR-72, a twin-engine turboprop used for short-distance regional flying, went down near its destination of the southern Iranian city of Yasuj, some 780 kilometers south of the Iranian capital, Tehran, where it took off.

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. Those on board included 59 passengers and six crew members, the state-run IRNA news agency reported Sunday night, lowering the death to 65 from an initially reported 66.

“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.

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.

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 checking and testing.” It wasn’t clear what led to the grounding, though Iran only recently regained access to the airplane parts market after the nuclear deal.