Investigators into the jetliner carrying 121 people which slammed into a hillside north of Athens were unable to determine why the pilot was not in his seat shortly before the crash.
The pilots of two Greek air force F-16 fighter planes scrambled to intercept the plane after it lost contact with air traffic control shortly after entering Greek airspace said they saw the co-pilot slumped over the controls. The pilot did not appear to be in the cockpit, and oxygen masks were seen dangling in the cabin, according to News24.
The fighter jet pilots also saw two people possibly trying to take control of the plane; it was unclear if they were crew members or passengers.
The plane might have run out of fuel after flying on autopilot, air force officials said, asking not to be named in line with Greek practice.