Fire officials say the blaze is threatening power lines as well as the communities of Hasley Canyon and Hathaway Ranch.

A brush fire started on a sweltering Thursday afternoon east of Lake Piru in Ventura County and led to evacuations as this week’s warm temperatures in Southern California reached their peak. The Canyon Fire was estimated at about 50 acres early Thursday afternoon before quickly spreading to more than 4,

Canyon Fire initially started today at 1:25 p.m. in Los Angeles, Ventura County, California. After being active for eight hours, it has burned 4,856.3 acres. 250 firefighters have been assigned to respond to the blaze, however, by Thursday evening, the fire remains uncontained and keeps burning. However, investigations into the cause are ongoing.