A brush fire that erupted two days ago northwest of Corona, charring about 120 acres, was 40 percent contained Thursday.
More than 200 firefighters are working to encircle the blaze, which broke out early Tuesday afternoon alongside the Corona (71) Expressway, near the boundary separating Riverside and San Bernardino counties.
For a time, the flames crossed into San Bernardino County, approaching Euclid Avenue in Chino, but the bulk of the fire remains concentrated just inside Riverside County, according to reports from the scene.
Crews from the Riverside County Fire Department, San Bernardino County Fire Department, Ontario Fire Department and Corona Fire Department are on the fire lines.
No homes or other structures are threatened by the now-low intensity blaze.
Officials said that a white sedan caught fire, possibly from overheating, and the vehicle was quickly engulfed, after which flames jumped from the car to dry vegetation nearby, culminating in a wildland blaze that prompted the CHP to shut down all northbound lanes of the 71 Tuesday.
Lanes were re-opened late Tuesday night.
One firefighter was evaluated in the early stages of the brusher for an unspecified, non-life-threatening injury, according to the Riverside County Fire Department.
No other injuries have been reported, and there was no word on when the blaze might be fully contained.