Fuel control switches for the engines of an Air India flight that crashed last month were moved from the ''run'' to the ''cutoff'' position moments before impact, starving both engines of fuel, a preliminary investigation report said early Saturday.

Following is a timeline of key events in the investigation to date: An Air India Boeing 787 Dreamliner bound for London crashes shortly after takeoff from Ahmedabad city, killing all but one of the 242 people on board.

A preliminary report by Indian authorities focuses on fuel cutoff switches as primary cause of Air India crash.