Marin County's top fire official says a downed PG&E power line sparked a wildfire that burned more than 150 acres and threatened dozens of homes near the community of Lagunitas.
"The investigators determined the cause to be a power line that came down into the grass," Marin County Fire Chief Jason Weber said in an interview Wednesday.
The power line that ignited the Irving Fire was located on Barnabe Mountain in Samuel P. Taylor State Park, Weber said.
There was a PG&E power outage affecting customers on Arroyo Road and Portola Avenue at the time the fire started Monday evening.
Weber said the outage is believed to have cut power to a county fire lookout and several communication towers on Barnabe Peak.