A quick-thinking driver saved a school bus full of kids after the vehicle erupted in flames Friday outside a California middle school, fire officials said.

The motorist, who has not yet been identified, safely evacuated the Rancho Santa Margarita Intermediate School students after the bus engine caught fire shortly after 8 a.m., the Orange County Fire Authority said.

The front of the school bus was engulfed in flames before it exploded, shocking video shows.

“The bus driver is a hero,” the Fire Authority tweeted.

There were no reported injuries. It was unclear how many students were on board.

The fire was under control in less than a half-hour, authorities said.