As the Line Fire near Highland exploded past 17,200 acres on Saturday night, Gov. Gavin Newsom has proclaimed a state of emergency in San Bernardino County.
Nearly 628 fire personnel from several agencies are battling the Line Fire from the ground and air, according to the California Department of Forestry and Fire Protection.
The Line Fire, which sparked Thursday evening near Base Line Street and Aplin Street in Highland, is active and spreading northward, authorities stated.
The fire expanded to 1,200 acres by Friday night. On Saturday afternoon, it was measured at 7,122 acres and on Sunday morning 17,459 acres.
More resources are arriving from across the state to battle the fire that is being fueled by critically dry vegetation and temperatures pushing past 100 degrees, fire officials stated.
Thunderstorm outflow winds are causing the fire to behave erratically, the San Bernardino County Fire Department reported on Sunday.
Three people have been injured in the blaze, according to Cal Fire, which did not reveal if the injured were civilians or fire personnel.