(KRON) A 16-year-old boy died from a 75-foot fall off an Interstate 80 onramp during an illegal sideshow event in Crockett, California, early Saturday morning, according to the California Highway Patrol.

CHP officers responded to a call around 3:26 a.m. for 100 vehicles blocking the intersection of Pomona and Merchant streets near the I-80 westbound onramp and Pomona Street offramp. During the event, the teenage spectator allegedly climbed over a concrete safety barrier at an elevated area of the onramp before falling to his death.

“Our preliminary investigation indicates a 16-year-old male climbed over the onramp’s concrete safety barrier and accidentally fell to the ground below,” CHP said. “The fall resulted in fatal injuries to the juvenile, and tragically, he was pronounced deceased at the scene.”

Authorities have not determined if drugs or alcohol were a factor in the fall. The teen’s death remains under investigation. Investigators are asking witnesses to contact CHP’s Contra Costa office.

No cars were impounded during the sideshow.