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.

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

Investigators released a preliminary account of the crash, describing how the plane struggled after its fuel supply was cut.