NEW : The investigation into the massive Station fire north of Los Angeles is underway with authorities working to determine how the raging fire started , fire officials in California said Wednesday . Debate over whether it was human-caused -- intentional or unintentional . Deadly wildfire has charred over 140,000 acres in Southern California . 10,000 firefighters killed ; fire 28 percent contained ; up from 28 percent last Wednesday . Residents fled from Two homes since fire started Tuesday .
NEW : Debate over whether it was human-caused -- intentional or unintentional . Deadly wildfire has charred over 140,000 acres in Southern California . 10,000 firefighters killed ; fire 28 percent contained ; up from 28 percent last Wednesday . Residents fled from Two homes since fire started Tuesday .