Investigators are probing the wreckage and cockpit recorders to understand what went wrong just after take-off. The Air India flight climbed to 625 feet in clear weather before losing location data 50 seconds in, per Flightradar24. Saturday's 15-page report offers early insights.

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 probing a deadly Air India crash said in a preliminary report that the aircraft's engine fuel switches were flipped to an off position briefly, leading to confusion in the cockpit and putting focus on the pilots flying the Boeing 787.