Authorities in India have released the preliminary results of their investigation into the the Boeing 787-8 Dreamliner crash in June that killed 229 of the 230 passengers aboard and all 12 crew members.

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

Fuel control switches to the engines of an Air India flight that crashed shortly after takeoff, killing 260 people, were moved from the "run" to the "cutoff" position moments before impact, a preliminary investigation report said Saturday.