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The so-called Border Fire crossed into southeastern San Diego County late Thursday morning after charring roughly 600 acres in the northern reaches of Baja California since the previous day, according to Cal Fire.

At least one crew member with the state agency was injured while battling the flames, suffering mild heat exhaustion, said Cal Fire Capt. Mike Mohler.

The blaze posed no danger to inhabited areas on the U.S. side of the border. It was unclear if it threatened or damaged any structures in Mexico.

Cal Fire sent ground teams, air tankers and helicopters to beat back the flames. Assisting in the effort were personnel from Heartland Fire & Rescue, the San Diego County Sheriff's Department, the U.S. Border Patrol, U.S. Department of the Interior's Bureau of Land Management and Forest Service.

The crews were able to halt the fire's spread at about 15 acres within about six hours, but unexpected wind gusts caused flames to cross the containment lines Thursday evening, Roxanne Provaznik of Cal Fire said.