The probe into last month's crash of an Air India plane in Ahmedabad is far from over and it is unwise to jump to any premature conclusions, airline CEO Campbell Wilson said in an internal memo on Monday after the release of a preliminary report by investigators.

Preliminary findings into last month’s Air India plane crash suggest the aircraft’s fuel control switches were turned off, causing a loss of engine thrust shortly after takeoff.

The CEO of Air India sought to draw a line under rife speculation around the cause of last month's air disaster in Ahmedebad, saying the preliminary investigation had ruled out a mechanical cause for the crash.