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, 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.

Piedmont’s Cybertruck crash, which left three dead and one injured, rattled the small Bay Area community. Details are sparse, but here’s what we know.