The cause of the crash is not yet clear, and authorities have not released any more information on casualties. According to state-run China Youth Daily, investigators on site, facing difficult terrain and poor weather, have not located the plane's so-called black boxes -- the flight data and cockpit voice recorders -- which could hold crucial clues to how the disaster unfolded.
Photos and videos posted by state media show giant plumes of smoke rising above the mountains following the crash. Search and rescue crews wade through the thicket, scattered with debris and plane parts. Wallets, ID cards and fragments of a phone were among personal belongings strewn on the ground, China Youth Daily reported.