Firefighters said they had achieved containment of the fire by around 7 p.m. and they would remain on scene through the night performing mop-up duties.
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Homes were evacuated in the area near the Bolsa Chica wetlands, but firefighters say they were able to keep the flames 100 yards away from the residential structures.
The blaze was first reported in the area near Pacific Coast Highway and Warner Avenue around 4 p.m. It was initially estimated at four acres, but grew quickly in dry brush. Thick black smoke could be seen for miles.
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There were no reports of damage to homes or injuries. The Bolsa Chica conservancy building was also protected from the flames.
Residents near the fire were seen grabbing hoses to soak their homes and prevent any embers from taking hold.
"We did a great job in being able to stop the fire 100 yards from the houses," firefighter Eric Blaska said.
The cause of the fire is under investigation.