Two fires erupted in the San Diego area on Thursday afternoon, prompting evacuations. The Border 2 Fire, which broke out in the Otay Mountain Wilderness area east of Chula Vista and north of the U.S.-Mexico border, has burned approximately 4,250 acres, according to the California Department of Forestry and Fire Protection.

Over 1,100 firefighters were “strategically pre-positioned” across Southern California to address "ongoing critical fire weather," Cal Fire said.

A fire spreading through the wilderness of San Diego County near the U.S.-Mexico border exploded to more than 500 acres within several hours on Thursday night. But the blaze, known as the Border 2 fire,