About 375 firefighters on Wednesday evening halted the forward progress of a "low-intensity" brush fire that scorched 78 acres in the Lake Sherwood area, the Ventura County Fire Department said.
No structures were threatened by the blaze, which broke out near Thousand Oaks shortly before 4 p.m. and was driven by light winds, fire Capt. Mike Lindbery said on Twitter.
There were no reports of injuries.
The fire was 0 percent contained as of 7 p.m., according to the captain, and was stopped about 2 1/2 hours later. Fire crews were expected to remain at the scene overnight.
News video from Sky5 showed active flames on hillsides above residential communities. Helicopters and fixed-wing aircraft from multiple agencies were seen dropping water and fire retardant from overhead.
No evacuation orders were issued.
An incident commander at the scene initially requested the closure of Potrero Road between Westlake Boulevard and Lake Sherwood Drive, according Lindbery. Shortly before 8 p.m., a "soft closure" of Potrero Road was announced between Pixton Street and Vista Oaks Way, meaning that only residents would be allowed into that area.
The Fire Department advised those living near the fire zone to "please stay indoors, close your windows & turn off air conditioners to avoid bringing smoke into the house," and "to be prepared to leave if conditions change."