BANGOR, Calif. —

Cal Fire crews are working to contain a fire that sparked in an area with steep and dense terrain in Yuba County on Sunday.

Crews responded to the Ponderosa Fire just after 3 p.m. in an area north of Marysville Road and east of Willow Glen in the Dobbins area.

By 4 p.m., Cal Fire said the fire had spread to 12 acres.

Photos from Cal Fire showed a thick gray plume of smoke rising from an area of thick brush, which could fuel the flames.

It's unclear if any structures were threatened.

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