PALO ALTO (KCBS) – The National Transportation Safety Board said Tesla is not at fault for a deadly crash involving a vehicle in Autopilot mode.

Last year, former Navy SEAL Joshua Brown was killed when his Tesla Model S in Autopilot mode collided with a truck on a Florida highway.

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According to the NTSB, Brown did not have his hands on the wheel for – as quoted in the report – “the vast majority of the trip” – despite repeated automated warnings in the car.

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No cause for the crash was found in the NTSB’s report.

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Tesla has advised drivers to maintain control over their cars even when the Autopilot feature is enabled.