STORY: The probe into last month's Air India plane crash is far from over.That's what airline CEO Campbell Wilson wrote in an internal memo Monday.He further said it would be unwise to jump to any premature conclusions.

An official report on the world’s deadliest aviation accident in a decade, seen by CNN, has answered one key question – but raised others.

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.