A fatal Tesla Cybertruck incident in Piedmont is being investigated by the National Highway and Traffic Safety Administration and California Highway Patrol after three Piedmont high school graduates died and another was hospitalized.

The National Highway and Traffic Safety Administration is in the process of reviewing details about last week's fatal Tesla Cybertruck crash in the Northern California city of Piedmont that left three young adults dead and a fourth critically injured.

The NHTSA, in general, often investigates crashes involving electric vehicles with self-driving features. Piedmont officials said last week that speeding is possibly a contributing factor, but they did not say whether the driver assistance features on the Cybertruck were engaged at the time of the crash.