Watch: What we know about the fuel switches on Air India flight 171

A preliminary report investigating the Air India crash finds both fuel switches were moved to the off position.

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Audio from the cockpit detailed in the report suggests confusion over the switches between the two pilots in the moments before the accident.

So how do fuel switches work and what role might they have played in the fate of flight 171? Our international business correspondent Theo Leggett explains.

This video has been updated to include additional information from the report.