Another person died in Northern California's massive Carr Fire, bringing its death toll to six, authorities said Sunday.

Shasta County Sheriff Tom Bosenko told reporters that the person did not abide by an evacuation notice.

A firefighter, a bulldozer operator and three people preparing to evacuate a home have also been killed in the blaze, which exploded over the weekend, growing from about 48,000 acres on Friday night to double that on Sunday, according to the California Department of Forestry and Fire Protection, or Cal Fire.

Ed Bledsoe ran to the store on Thursday to grab supplies. Within an hour, his house, his wife, Melody, 70, and two of their great-grandchildren, James, 5, and Emily, 4, were gone.

Carla Bledsoe, facing the camera, hugs her sister Sherry on Saturday outside the sheriff's office after hearing that Sherry's children, James and Emily, and their grandmother, Melody Bledsoe, were killed in a wildfire in Redding. Marcio Jose Sanchez / AP

"He lost everything," Donald Kewley, the boyfriend of one of the Bledsoes' granddaughters, told NBC affiliate KCRA of Sacramento.

"You can't lose more than family. And then you lose everything on top of that," Kewley said. "Man's got the shirt on his back and the pants on his waist. That's it."

The blaze was 20 percent contained and had charred more than 90,000 acres as of Monday morning, Cal Fire said.

As for how to describe the fire, "'extreme' is not even the right adjective to use anymore," Chris Anthony, a division chief with Cal Fire, said Sunday.

"It is just an understatement, because the fire is so explosive now in California," Anthony said.

The fire has destroyed 874 homes or other structures and threatens 5,000 more near the city of Redding, the seat of Shasta County and an urban center of about 91,000 people. Around 40,000 residents have evacuated their homes.

On Sunday night, authorities arrested two people on suspicion of looting homes that had been evacuated.

Sixteen people have been reported missing since the blaze broke out Monday afternoon northwest of Redding, Bosenko said. Authorities are still investigating seven of those cases, he said.

A vehicle's mechanical failure is believed to have caused the fire, and years of drought and record heat waves fueled its staggering growth.

Cal Fire Incident Commander Brett Gouvea told reporters Sunday that the fire was continuing to expand in remote, inaccessible areas, although it had not moved further into Redding.

"The positive thing about that — we're out away from many of the residents, structures and critical infrastructure around Shasta County," he said. "However, that does pose some threats to communities that are farther out."

Gouvea added that firefighters were working hard to keep the fire from striking those areas.

"We're here until the end," he said. "We'll bring some peace to this chaos."

Almost 3,400 fire personnel were battling the fire, some of them on 36-hour rotations, with 17 helicopters, 334 fire engines, 68 dozers and 59 fire crews, according to Cal Fire.

Officials said the Carr Fire was one of 17 major fires scorching 200,000 acres across the state. Also among them was the Ferguson Fire, which has torn through more than 54,000 acres around Yosemite National Park and killed a 36-year-old heavy equipment operator with Cal Fire on June 21.

On Sunday, the Mariposa County Sheriff's Office and the National Park Service said a Sequoia and Kings Canyon National Park firefighter died earlier in the day while battling the blaze.

The park service identified the firefighter as Brian Hughes, 33, a four-year veteran and member of an elite hotshot crew. Hughes was working in an area with a large number of dead trees, one of which struck him, the park service said.

CORRECTION (July 30, 10:17 a.m.): An earlier version of this article misstated the last name of the man who lost his wife and great-grandchildren. His name is Ed Bledsoe, not Ed Roberts.