An Iranian plane with 66 people on board has apparently crashed near the city of Semirom in the Isfahan Province of Iran, local media report. The aircraft went off radar midflight from Tehran to Yasuj.

The Iran Aseman Airlines flight disappeared from radar in a mountainous area. The search and rescue operation is hampered by bad weather, preventing helicopters from landing, Iran’s Press TV reports.

The airline said none of the 60 passengers and six crew members appear to have survived in the crash.

The missing plane is an ATR 72, a French-Italian short-haul regional airliner, which was introduced in the late 1980s. Iran signed a contract to buy 20 ATR 72s in 2016 with an option for 20 more, and received the first batch last year. The fleet of Iran Aseman Airlines, however, is older, with aircraft delivered between 1993 and 2009, according to a planespotters.net database.

Semirom is located about 80km north of Yasuj, the capital of the southwestern Kohgiluyeh and Boyer-Ahmad Province.