A brush fire erupted Friday in a canyon north of Moreno Valley, scorching 50 acres and threatening residential properties.
The blaze was reported about 1 p.m. in the area of Reche Canyon Road and High Country Drive, near the boundary separating Riverside and San Bernardino counties, according to the Riverside County Fire Department.
The agency said multiple engine and hand crews from the county, Idyllwild Fire Protection District and Cal Fire-San Bernardino County were sent to the location and encountered flames moving at a rapid rate through medium brush.
At least one home and outbuildings were in the path of the brusher, which was spreading to the southeast, according to reports from the scene.
The area is lightly populated, with both single-family dwellings and mobile homes.
Cal Fire air tankers and water-dropping helicopters initiated a series of runs on the blaze, but as of 2 p.m., the forward rate of spread had not been stopped.
California Highway Patrol officers were conducting traffic control in the area due to the large amount of public safety equipment. It was not immediately clear whether Reche Canyon Road might be shut down.
The cause of the fire was unknown.