Cal Fire sent out a press release Thursday morning stating PG&E is not to blame for the start of the fire.
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Instead, it was a "private electrical system adjacent to a residential structure," the statement said.
Investigators did not identify any violations of California State law.
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You can read the full press release here.
The Tubbs Fire destroyed more than 5,000 structures, burned more than 36,000 acres and killed 22 people.
MORE: Most destructive wildfires in California history
Most destructive California wildfires in history