A slow-moving 5,200-acre brush fire burning in a federal preserve on the southern tip of Riverside County, along the boundary with San Diego County, was triggered by a faulty electrical panel on private property, officials confirmed Friday.
No other details were available.
The fire was one-fifth contained and no longer threatening any homes or other structures, situated within the Beauty Mountain Wilderness, maintained by the U.S. Bureau of Land Management.
One Cal Fire water-dropping helicopter was making targeted drops around the perimeter of the fire Friday afternoon.
Four structures were destroyed by the blaze, which prompted an evacuation order for the scattered homes south of Highway 371, north of the county line, west of Terwilliger Road and east of Foolish Pleasure Road.
Evacuation warnings were also in place in parts of Riverside and San Diego counties.
The orders were expected to be lifted anytime.
The blaze erupted about 12:30 p.m. Monday in the area of Richard Nixon Boulevard and Tule Peak Road, according to the Riverside County Fire Department.
At its height, more than 1,000 personnel were battling the blaze, including county fire crews, Cal Fire San Diego crews and BLM firefighters.
One flank of the fire briefly crossed into San Diego County earlier this week, blackening 2 open acres before firefighters extinguished that section of flames.
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