Cal Fire (file)

Cal Fire (file)

JACUMBA, Calif. - A brush fire sparked by a burning structure blackened several dozen open acres in the remote southeastern reaches of San Diego County Friday.

The blaze began spreading just south of Old Highway 80 in the Jacumba area shortly before 3:30 p.m., according to Cal Fire.

Within 90 minutes, the flames had destroyed two outbuildings, crossed the roadway and spread over a roughly 25-acre area while moving slowly to the north through heavy vegetation, said Mike Mohler, a fire captain with the state agency.

No other structures were threatened, but the blaze was burning under some San Diego Gas & Electric transmission cables, according to Mohler. No damage to the utility lines had been reported as of early evening, he said.

About 100 personnel were working to control the blaze, equipped with four air tankers, two helicopters, 13 fire engines, four water trucks and a bulldozer.

The structure that initially caught fire apparently was a shed or similar non-residential building. It was unclear who or what set it ablaze, the captain said.