An Iranian commercial plane crashed on Sunday in a foggy, mountainous region of southern Iran, killing all 66 people on board, state media reported. Aseman Airlines spokesman Mohammad Taghi Tabatabai told state TV that all on Flight No. 3704 were killed. The plane carried 60 passengers, including one child, and six crew members. Due to foggy conditions, rescue helicopters couldn't reach the crash site in the Zagros Mountains, state TV reported.