NBC Bay Area’s Investigative Unit has obtained video evidence that experts say should prompt Cal Fire to reconsider the cause of the deadly 2017 Tubbs fire, which leveled Santa Rosa neighborhoods and killed 22 people.

It was the only major Wine Country wildfire that was not blamed on PG&E equipment.

In its final report, Cal Fire investigators identified the area around a hilltop home, owned by 91-year-old Ann Zink, as the origin of the Oct. 8 fire.

Cal Fire found the fire was caused by a substandard private electrical system spanning much of the 10.5 acre property.

But a surveillance video is raising new questions. It was taken from the Bennett Lane Winery and shows a flash at 9:20 p.m. That’s more than 20 minutes before the fire was first reported to authorities.

“It’s identical to l

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