The fire started around 7 p.m. on in Newbury Park near Potrero Road and Wendy Drive, according to the Ventura County Fire Department.
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The blaze, dubbed the Wendy Fire, started out at less than one acre but exploded as fire crews had difficulty accessing the flames in the rugged terrain. It had been 25% contained as of 11 p.m. Thursday.
Nearby homes were not threatened as the flames advanced southward into open space.
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Potrero Road was shut down between Wendy Drive and Reino road, according to the Ventura County Sheriff's Department.
No evacuation orders have been issued.
DEVELOPING: This story will be updated as more information becomes available.