Kern County firefighters are battling the so-called "Jack Fire' off Highway 46, which is at 50 acres, said the department.

Officials said forward progress of the fire has been stopped. It remains at 50 acres. Firefighters will remain on scene to fully extinguish the fire.

The fire was reported just after 6:20 p.m. in the area of Highway 46 near Annette Road, west of Kecks Corner.

The cause of the fire is unknown at this time.

CHP is the area monitoring traffic. Drivers should expect delays.

This story is developing.

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