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.

Over the weekend, the Indian Aircraft Accident Investigation Bureau released a preliminary report on last month’s crash of Air India flight 171, which killed 260 people, 19 of them on the ground. The aim of a preliminary report is to present factual information gathered so far and to inform further lines of inquiry.