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RAMONA, Calif. — A burning vehicle ignited brush alongside state Route 67 Friday afternoon, causing a wildfire that threatened some homes as it spread over rugged, hilly terrain east of Poway.

The blaze erupted near Rockhouse Road shortly after 2:30 p.m., according to Cal Fire.

Crews were able to hold the wind-blown fire at about two acres for a time, but the flames wound up jumping containment lines in the late afternoon and began moving across more open land.

As of 5:30 p.m., the burn area had grown to roughly 20 acres, the state agency reported.

Deputies cleared people out of about 20 homes on Rockhouse Road, Jackie Street and Tommie Lane as a precaution, sheriff’s Lt. Jim Walker said.

By shortly before 6 p.m., crews fighting the fire on the ground and aboard air tankers and water-dropping helicopters had again halted the spread of the blaze, Cal Fire Capt. Kendal Bortisser said.

No structural damage or injuries were reported.