Dozens of homes were destroyed in Orange County, , on Wednesday by a 200-acre, fast-moving brush fire.

The flames engulfed at least 20 homes in the city of Laguna Niguel and advanced up the hillside. Around 900 other homes remain under voluntary and mandatory evacuations as firefighters battle the coastal fire, said TJ McGovern, Orange County Fire Authority's assistant chief of field operations, during a press conference on Thursday.

"What we experienced was a fire, wind-driven, down a relatively level flat terrain, until it hit the side of that slope," O.C. Fire Authority Chief Brian Fennessy said, according to CBS. "And fire is always going to run uphill faster, wind or no wind. But when you have that strong a wind blowing that fire uphill. And if you're familiar with that area, it is extremely steep, extremely thick vegetation that has not burned in probably decades."

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One firefighter was taken to the local hospital after getting injured battling the fire on Wednesday.

Authorities have not released an estimate regarding how much of the 200-acre fire is contained as of Thursday morning.

The fire was reported Wednesday afternoon shortly before 3 p.m. near the South Orange County Wastewater Authority's Coastal Treatment Plant.

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The cause of the fire is under investigation. However, electricity provider Southern California Edison disclosed that there was "circuit activity occurring close in time to the reported time of the fire" in a statement on Thursday.