Warning: This livestream contains explicit language.

SAN DIEGO - A Facebook Live video has emerged of the moments immediately following Saturday's fatal crash by a pickup truck onto a group of people at Chicano Park.

The victims were identified as a 62-year-old man and 50-year-old woman (both from Chandler, Arizona) and a 59-year-old man and 49-year-old woman (both from Hacienda Heights, Calif.). Their names have not yet been released.

The crash happened around 3:34 p.m. when a driver in a GMC pickup truck was traveling northbound on I-5, transitioning westbound onto the Coronado Bridge. According to the California Highway Patrol, the driver lost control and the truck fell about 60 feet below onto a vendor's booth.

"All I heard was a boom, and all of a sudden we just see this truck flying down," said witness John Vazquez. "We see this truck just falling off of the bridge and it lands on the booth nose first."

The driver of the truck, later identified as 24-year-old Richard Anthony Sepolio, was placed under arrest for being under the influence of alcohol when the crash occurred, according to CHP Officer Jake Sanchez. He is facing four counts of vehicular homicide and DUI. There may be additional charges as the investigation continues.

"The driver still had a cell phone in his hand," Vazquez said. "That's what we noticed."

Sepolio is employed by the U.S. Navy and is stationed in Coronado. He was transported to UCSD Medical Center with major injuries. Eight others were injured, one seriously, and four were killed.