A brush fire that erupted Wednesday just north of Lake Mathews scorched about an acre before crews got it partially contained.
The non-injury blaze was reported shortly before noon in the area of La Sierra Avenue and Lakepointe Drive, according to the Riverside County Fire Department.
The agency said multiple engine crews from the county and Corona Fire Department were sent to the location and encountered flames moving at a slow rate through medium vegetation.
No homes or other structures were threatened.
A Cal Fire water-dropping helicopter and air tanker were called in to make runs on the brusher, aiding firefighters in establishing tentative containment lines, according to reports from the scene.
There was no immediate word on how the fire started.