Tehran, Feb 18: A passenger plane crashed in central Iran on Sunday killing all 66 people on board, authorities said. The ATR 72, a twin-engine turboprop operated by Aseman Airlines, crashed due to bad weather into the Dena Mountain near the town of Semirom, an official at the Iranian carrier confirmed to the media. The plane was flying from Tehran to the southwestern city of Yasuj, reports Press TV. Officials in Semirom said the crash site was hard to reach and rescue helicopters had been unable to land because of heavy fog and rain. The spokesman for Iran's emergency services Mojtaba Khaledi said rescue teams have reached the crash site by land and were trying to find the debris. Air controllers lost contact with the airplane at around 8 a.m. The people on board were 60 passengers, two security guards, two flight attendants, the pilot, and co-pilot.