Update, 9:20 a.m. Wednesday: The Marin County Fire Department says the Irving Fire, which started Monday evening, is 65 percent contained.
The department says its acreage estimate remains the same -- 152 acres -- and no further growth is expected. Full containment is expected by the end of the week.
Marin County Fire Chief Jason Weber told KQED's Ted Goldberg on Wednesday that investigators believe the fire was sparked by a downed PG&E power line on Barnabe Mountain.
Update, 10:50 p.m. Tuesday: The Marin County Fire Department has updated the stats and status for the Irving Fire:
- After more careful mapping of the blaze, it's estimated to have burned 152 acres.
- Containment has increased to 45 percent.
- The Fire Department says it will be attending to hot spots amid drier, windier weather, and firefighters are expected to be on the scene, on Barnabe Mountain northwest of Lagunitas, through Thursday.
Update, 6:15 p.m. Tuesday: Marin County firefighters, aided by crews from several local fire departments and water drops by Cal Fire helicopters, say they're gaining the upper hand on a 115-acre blaze that started Monday evening near the community of Lagunitas.