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The Carbon Canyon brush fire in Orange County, CA, has reached over 500 acres, the Los Angeles Times reports.

More than 200 firefighters have achieved 87% containment of the fire, which broke out at 10:45 a.m. Thursday.

Carbon Canyon Road was reopened Friday at noon after firefighters closed the road to fight the fire.

The blaze has burned 508 acres as of 1 p.m. Friday, but was 87 percent contained, Brea-Fullerton Battalion Chief Steve Wood told CBS News. 

There were no reports of damage, injuries or immediate threats to structures, according to the Los Angeles Times. The main fire flank was burning northwest toward Los Angeles County, with a smaller branch moving northeast toward the Chino Hills, officials said.

The cause of the blaze is under investigation.

Firefighters from Brea, Fullerton, the Orange County Fire Authority, the Los Angeles County Fire Department, Cal Fire and the Chino Valley were battling the blaze, CBS reports. Two OCFA helicopters and an airplane were deployed to douse the flames.