50-acre brush fire burning in San Bernardino National Forest, officials say

Between 250 and 300 firefighters are battling a 50-acre brush fire burning in the San Bernardino National Forest on Saturday, officials said.

The brush fire is 5 percent contained and was first reported in the area of Highway 330 near Forest Road, according to San Bernardino National Forest officials on Twitter.

The incident began as a small, 1-acre fire before quickly increasing to at least 25 acres in less than an hour.

San Bernardino County and Cal Fire firefighters were assisting forest officials in the firefight with resources from the ground and air.

There have been no reports of injuries or threatened structures.