The Piedmont High School graduates were killed when the truck they were driving crashed at Hampton Road between Sea View and King avenues about 3 a.m. Wednesday. The truck caught fire after the crash and one person, who has not been identified, was pulled by a passerby and taken to a hospital.

The NHTSA 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.

The mother of the survivor of Wednesday morning's horrific Tesla Cybertruck crash in the East Bay town of Piedmont that left three young adults from the East Bay community dead on Friday identified her son and the three other victims.