SAN FRANCISCO—California Highway Patrol’s Golden Gate Division are investigating a series of fatal crashes that transpired over the holiday weekend and early this week including a solo crash that happened on Sunday, July 5.

Jose Valdez, 29, of Vallejo, was reported deceased after crashing his Cadillac in an embankment off of the Benicia Road off-ramp on Highway 80. Officers responded to the accident at 2:29 a.m. and stated Valdez was ejected from his vehicle due to not wearing a seatbelt.

While the investigation has yet to be finalized, investigators suspect it could have been caused by an impairment.

CHP responded on Monday, July 6 to another collision involving multiple cars, on US-101 going southbound in Brisbane. On Facebook, they released photos of the incident with the update:

Photo of the accident on US-101.

“Officers and fire personnel arrived at the scene and found three of the four involved vehicles engulfed in flames. We are thankful that all of the involved parties were able to exit their vehicles and incurred only minor injuries.”

CHP is still conducting an investigation to uncover the cause of the collision and have asked any potential witnesses to contact them.

Later on Monday, another accident was reported to CHP at 9:41 p.m. where a Jeep veered off the road on Highway 4 resulting in a solo crash.

An 18-year-old female passenger was pronounced dead. Authorities have yet to disclose her name to the public. The driver of the vehicle escaped with minor injuries. The cause is still unknown, but they do not suspect impairment as a cause of the crash.