Transcript for Maria Fire forcing evacuations and threatening homes in California
He mentioned the wildfires. We'll turn to the wildfire burning out of control in southern California. Thousands of homes are threatened. The situation is urgent and erratic as shifting winds are posing a huge challenge for firefighters. Here's ABC's Marci Gonzalez. Reporter: This morning, we're learning what may have sparked the massive Maria fire still burning out of control in southern California. The inferno incinerating more than 9,000 acres, fanned by relentlessly powerful and shifting Santa Ana winds. This and at least two other buildings devoured by flames. Between it was 300 yards away until fully engulfed in maybe five minutes. Reporter: 8,000 people forced to evacuate, packing up what they could as that ominous glow moved down the mountain. Some now allowed to return home as firefighters continue their assault. And now the investigation into the cause. This photo from the Ventura county fire department showing the flames igniting Thursday night right next to power lines. The utility company so Cal Edison saying minutes before the wildfire started it had turned power back on to high voltage lines in the area that ironically had been turned off to prevent a fire. No matter how many times they shut it off if they turn it back on again it's till going to be there. This problem presents itself so it might just take a whole system overhaul. Reporter: This is such a major concern and frustration for people there. Especially considering it was power lines from the same utility company that sparked the deadly Thomas fire there two years ago which led to those devastating mudslides. Now firefighters battling the Maria fire hope to finally get an upper hand once those strong winds start to weaken later today. Whit? All right, Marci Gonzalez for us in Los Angeles, thank you.
This transcript has been automatically generated and may not be 100% accurate.