Los Angeles County Fire Chief Daryl Osby says one resident suffered minor burn injuries in the fire being fanned by gusty Santa Ana winds that spit embers into the city below.
At least 2 ½ square miles of dry brush were charred in the wilderness area about 25 miles northeast of downtown Los Angeles.
Police say the fire was started by three people throwing paper in a campfire. They were booked on charges of recklessly starting a fire.