It's unclear why the 1999 Honda veered off eastbound Highway 92 around 9:40 p.m. near the Foster City Boulevard exit, but so far there are no obvious signs alcohol was a factor, said California Highway Patrol Officer Art Montiel. Intoxicated driving has not, however, been completely ruled out.
The boys, aged 12 and 16, killed in the crash were riding in the back seat with their 18-year-old brother Jesus Reynaga-Reyes, who was rushed to Stanford hospital with major injuries. Authorities said all three lived in Redwood City, but didn't release the boys' names. It wasn't immediately clear where the vehicle was going.
Montiel said they are sure one person -- front seat passenger Eduardo Zaragoza, 18, of San Mateo -- was wearing a seat belt. He walked away from the crash with minor injuries. Officers were trying to confirm whether the others were belted in.
The passenger who was not injured is believed to be a cousin of the driver, 21-year-old Juan Pablo Zaragoza Hernandez, authorities said.
It appears the vehicle first struck a guardrail, rolled over and then hit a light pole and finally a roadside utility box. The crash is under investigation.
It is the third crash to kill multiple members of the a family on Peninsula freeways since November. In the first, two sisters died on Highway 101 near Palo Alto while driving home to San Bruno after a marathon night of Black Friday shopping. Then Dec. 14 a sister, brother and mother from Santa Clara were killed on the side of Interstate 280. They ended up on the road shoulder after getting a flat tire.
Contact Joshua Melvin at 650-348-4335. Follow him at Twitter.com/melvinreport.