Two cars were racing when one lost control, crashed into an SUV and then hit five other vehicles, the California Highway Patrol said.
Both of the cars involved in the street race burst into flames, but no one was burned.
Witnesses said that could in part be because of a passing motorist, who pulled over to help.
"Some guy pulled over and he had a fire extinguisher," witness Robert Ramirez said. "(He) put out the fire in the first car, which had a victim in there. He was trying to break the windows and couldn't break it so 'til the firemen got here."
One person was rushed to the hospital and is in critical condition. The other person injured was treated and released at the scene. No arrests have yet been made.
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