NEW : Blaze is `` human-caused , '' officials say . The fire is threatening more than 4,000 homes . It started in the mountains of San Diego County on Friday and has spread to other parts of Southern California. -- It 's already torched more than 35 square miles -- and the massive mountain fire in southern California is nowhere near under control . The blaze is 15 % contained , a forest service officials say .
NEW : Blaze is `` human-caused , '' officials say . The fire is threatening more than 4,000 homes . It started in the mountains of San Diego County on Friday and has spread to other parts of Southern California. The blaze is 15 % contained , a forest service officials say .