A firefighter waters down a back burn on Cloverdale Road near the town of Igo, Calif., on Saturday.
The sixth victim, who was not identified, did not flee despite receiving an evacuation warning, Bosenko said.
More than 4,500 buildings were under threat, officials said.
"Everyone we come into contact [with] in those neighborhoods, if they don't have a legitimate reason to be there, if we don't arrest them for looting, they'll be arrested for something else", he said. "More people living in high fire risk areas than usual".
About 12,000 firefighters have responded to the wildfires from within California.
About 100 law enforcement officers and 260 National Guard soldiers were helping with evacuations and providing security in empty neighborhoods.
He said the fire behavior was so erratic, there were tornadoes within the fire "tossing around equipment, blowing windows out of Cal Fire pickup trucks".
He said he was told that the sheriff's office picked them up and rescued them.
The Carr Fire, the deadliest and most destructive of nearly 90 wildfires burning from Texas to OR, has charred almost 34,000 hectares of drought-parched vegetation since erupting last Monday. Two belonged to the crews fighting the fire.
The devastation astounded Shasta County Supervisor Leonard Moty, who represents much of the area that burned. "I've been a lifelong resident of this community".
"I talked to them until the fire got them", he was quoted as saying.
Severe Weather Expected Tonight
Despite a cold front moving in on the area, we'll still be very hot with temperatures peaking right around noon to 1pm. More try time arrives for the end of the week and the weekend, but there will be shower and storm chances.
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While her parents grabbed photos and corralled their dogs, the 16-year-old scooped up her phone, an outfit and a new pair of sneakers she bought while back-to-school shopping.
"It's exhausting", she said.
Within days, she learned the family's house had been destroyed.
Fire officials said high temperatures, and large amounts of dried brush are stoking the flames and causing massive amounts of smoke, making containment efforts hard.
"Extreme fire conditions continue to challenge firefighters last night", Cal Fire said in a statement released on Sunday. The blaze had blackened 150 acres and was at 10 percent containment. An estimated 38,000 people are away from their homes, awaiting a chance to return.
Earlier in the day, with flames exploding around Whiskeytown Lake, people tried to save boats at a marina by untying them from moorings and pushing them to safety.
While the smoke provided some relief for crews on the ground, it complicated the aerial assault on the fire being waged by helicopters and air tankers, limiting their visibility.
In the country as a whole, there were a total of 39 active fires, with over 239,000 acres up in flames, according to the National Interagency Fire Center.
Shasta County Sheriff Tom Bosenko said on Sunday that the remains of an unidentified victim were found within the boundary of the Carr Fire near Redding.
He said the hospital was preparing high-risk patients to be evacuated but there were no immediate plans to do so. By Saturday morning, the fire grew to 80,906 acres and is only around 5% contained, according to officials.
The Ferguson fire has left seven others injured. The Ranch and River fires, known together as the Mendocino complex fire, began Friday afternoon and exploded over the weekend, destroying four homes and threatening thousands more, Cal Fire officials said. Almost 5,000 more homes were being threatened by the 75-square-mile (194-square-kilometer) blaze, which was just 5 percent contained.