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, was miles from any structures or homes, and firefighters said they were making progress controlling it.

Mexico sent a team of firefighters to California on Saturday to help teams battling the raging wildfires that have devastated parts of Los Angeles.