A solo vehicle crash involving a Tesla Cybertruck left three young people dead early Wednesday morning in the Northern California city of Piedmont, authorities said.

Three people were killed when the Tesla Cybertruck they were riding in hit a tree and retaining wall in Piedmont, California and burst into flames.

PIEDMONT, Calif. -- Three people are dead and one is injured after a solo vehicle crash early Wednesday, police say. A Tesla Cybertruck crashed at Hampton road and King Avenue just after 3 a.m., in Piedmont, California.

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 Piedmont that left three young adults dead and a fourth critically injured.

Responding officers used fire extinguishers, "but the fire was too intense for the extinguishers to be effective," the police chief said.

A stunning crash in Piedmont that killed three college students, leaving a fourth with severe injuries, has triggered deep suspicion of the vehicle involved: a Tesla Cybertruck, the electric pickup with a space-age look — and a history of engineering mishaps.