Crews were battling a 310-acre brush fire that spread rapidly after sparking near the Ridge Route Monday, officials said.

The Ridge Fire was reported around 4 p.m. east of the 5 Freeway along Highway 138, near the small community of Neenach, according to the Los Angeles County Fire Department.

Highway 138 was closed in both directions at Ridge Route Road.

The flames were burning in heavy fuels. They spread to 100 acres within half an hour, and to 200 acres within an hour, firefighters said.

By 6:30 p.m., forward progress had been halted and the flames were 40% contained, officials said.

The fire consumed one home in the Gorman area, a Fire Department spokesperson told the Los Angeles Times.

L.A. County sheriff’s officials could not immediately confirm whether evacuations were being considered. However, the Times reported that no additional structures were threatened.

More than 300 firefighters had responded to the blaze, officials said.

Crews were expected to remain on scene overnight to strengthen containment lines in steep, rugged terrain.

No further details were available.