A 16-year-old boy died after falling 75 feet off an Interstate 80 on-ramp during a sideshow in Crockett, according to a Facebook post by the California Highway Patrol.

Authorities at CHP’s Contra Costa office received a call around 3:26 a.m. Saturday of a sideshow involving over 100 vehicles blocking the intersection of Pomona Street and Merchant Street near the entrance and exit ramp for I-80 westbound on Pomona Street.

Upon arriving at the scene, officers received reports of a spectator who climbed over the concrete safety barrier of the Pomona Street entrance ramp to westbound I-80 and fell to the ground. The responding officers went to the site where the teenager fell. Their preliminary investigation indicated that the boy had climbed over the barrier and accidentally fallen to the ground below. He was pronounced dead at the scene.

CHP said the incident is under investigation. Anyone who witnessed the incident or the events leading up to it are instructed to contact CHP’s Contra Costa office in Martinez at 925-646-4980 or email your contact information to [email protected] to be contacted by the investigating officer.