A brush fire burned near the Grapevine in northern Los Angeles County Friday.
The blaze, dubbed the Motor Fire, had grown to about 20 acres by noon, up from 3 to 5 acres when it was first reported at about 10:45 a.m., the Los Angeles County Fire Department said.
As of just before 1:30 p.m., fire remained at 20 acres, though forward progress had not yet been stopped.
Firefighters halted forward progress by about 3:30 p.m., but officials did not provide an updated size estimate.
Located along the northbound 5 Freeway south of Vista del Lago, the fire burned areas very close to an overturned big rig and construction excavator, though authorities have not confirmed that the vehicles are connected to the blaze.
One person is being medically treated, though no injuries have been reported, the department added.
Luis Zuniga and Mitzi Vazquez contributed to this report.