Clark was arrested Tuesday night in connection with the fire, which is burning into its fourth day and has burned more than 18,000 acres.
The Mendocino Complex fire has been declared the largest in state history and has already engulfed 290,692 acres.
Despite mandatory evacuation orders, Castro stayed behind to protect his Lake Elsinore home from looters, he said.
Nielsen said she saw "truly heartbreaking" scenes of homes reduced to ash and fences replaced with caution tape.
Police said Wednesday the blaze may have begun as an act of arson.
At least 43 killed, including children, in attack on Yemen market
Yemeni tribal leaders told the AP the Saudi-led US -backed coalition fighting Shiite Houthi rebels was behind the airstrike. The Iran-aligned Houthis regularly fire into Saudi Arabia and have targeted its capital, Riyadh , with ballistic missiles.
Clark's arraignment was delayed Thursday and could take place Friday, according to Rebecca Moss, a spokeswoman for the district attorney's office. There are teams from almost every central coast fire department at the more than two dozen wildfires burning in California.
As of Friday evening, more than 21,000 people remained under evacuation orders.
The Carr Fire has burned 177,450 acres as of Thursday morning.
He added: "I woke up and my stuff was all on fire", he said.
Furious flames and smoke can be seen billowing across the area in and around Lake Elsinore. He's being held on $1 million bail.
People watch flames from the Holy Fire outside Glen Ivy Hot Springs in Corona, California, southeast of Los Angeles, on August 10, 2018. He also could face life in prison if he's convicted, the AP reported.
History made at Lord's as rain prevents play on day one
Joe Root has confirmed that the 20-year-old debutant Ollie Pope will bat at No 4 in the second Test against India at Lord's today. Neither England nor India , who might also make changes, are obliged to confirm their teams until the toss takes place.
The blaze north of San Francisco has grown to the size of Los Angeles since it started two weeks ago, fueled by dry vegetation, high winds and rugged terrain that made it too unsafe for firefighters to directly attack the flames now spanning 470 square miles. He faces sentences ranging from 10 years to life imprisonment.
Volunteer Fire Chief Mike Milligan, who also has a cabin in the area, told the Orange County Register Clark has long feuded with a neighbor and other cabin owners.
Areas of direct smoke impacts and Unhealthful air quality may include portions of: San Bernardino County: Areas 32 (Northwest San Bernardino Valley), 33 (Southwest San Bernardino Valley), 34 (Central San Bernardino Valley), 35 (East San Bernardino Valley), 36 (West San Bernardino Mountains), 37 (Central San Bernardino Mountains), and 38 (East San Bernardino Mountains). They were trying to keep the flames from devouring neighborhoods and taking lives, as enormous fires still burning in Northern California have done.
Though it's exploded in size, more firefighters are fighting a fire near Redding that has killed six people and destroyed more than 1,000 homes and businesses.
Now a smoky haze hovers over much of the state, creating unsafe breathing conditions.
The sheer size of the fires brings new horror as the state still reels from enormous blazes past year and has yet to hit its most unsafe months historically.
The Oscars to introduce a new award for popularity
On Wednesday afternoon, the Academy announced that it would be making a few major changes for its 91st award ceremony in 2020. Starting with the 92nd Academy Awards in 2020, a new Oscar will be awarded for achievement in popular film .