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.

A focus on the Boeing 787’s fuel switches in a preliminary assessment raised questions about the pilots’ actions, but much is still unknown about Flight 171.

The fuel switches to both engines on the Air India Flight 171 moved to the "cutoff" position immediately before the crash that killed 260 after taking off on June 12.