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.

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.

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

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