A Pacific Gas and Electric worker was killed while working to restore power in an affected region, according to utility spokesman JD Guidi.
The trio were arrested on suspicion of interfering with firefighters and not having authorization to be in an evacuation zone.
NOAH BERGER via Getty Images The Ranch Fire, part of the Mendocino Complex Fire, crests a ridge as Battalion Chief Matt Sully directs firefighting operations on High Valley Rd. near Clearlake Oaks, California, on Sunday.
The Mendocino Complex Fire, made up of two separate conflagrations that merged, grew to 283,800 acres (114,800 hectares) and was still growing, California Department of Forestry and Fire Protection said.
The fire has razed more than 1,600 buildings, including some 1,000 homes, state officials say.
The Carr Fire has displaced more than 40,000 people, while the Mendocino Complex Fire has grown to the fifth-largest in state history.
He was the seventh person to die in that blaze, which has scorched more than 160,000 acres (64,750 hectares) in the scenic Shasta-Trinity region north of Sacramento, including two young children and their great-grandmother whose home was overrun by flames, and two firefighters.
Overall, experts say Trump's Twitter remarks ignore two of the biggest factors in the wildfires: Climate change, which is likely exacerbating the droughts that lead to fires, and increased development near forests that makes the fires more unsafe to life and property.
As of Sunday morning, the fire has burned 154,524 acres and is 41 percent contained. By Monday, it has become the second-largest California wildfire on record, surpassing the size of a massive blaze that killed 15 people in 2003 in San Diego County.More news: Assam issue India's internal matter: Official UNB, Dhaka
As of Monday, the Mendocino Complex Fire shows little sign of slowing down.
A couple of fast-growing wildfires in northern California expanded to more than two-thirds the size of sprawling Los Angeles as more residents were ordered to evacuate their homes and tired firefighters endured high temperatures and gusting winds.
"This year's changing weather pattern is leading to more severe and destructive wildfires".
Three men were given citations on Saturday for refusing to leave an area where firefighters wanted a tanker plane to make an air drop, causing the plane to be diverted, according to a post on the Lake County Sheriff Office's Facebook page.
"California wildfires are being magnified & made so much worse by the bad environmental laws which aren't allowing massive amount of readily available water to be properly utilized".
Another blaze that ignited last week in the Sierra Nevada has damaged a historic Northern California resort in the Stanislaus National Forest.
"The big fires have scores of water-dropping helicopters getting water from nearby lakes and reservoirs", he said. ZACA FIRE (Santa Barbara County), July 2007 Acres burned: Structures destroyed: Deaths: 7.
Nationally, wildfires have burned about 5.1 million acres this year, about 1.1 million acres above the 10-year average for the seven-month period, according to the National Interagency Fire Center.
Firefighters have achieved more than 40 percent containment of that fire, which had reached into remote areas of the country's third-oldest national park.