Another person was found after the fire consumed another home in Shasta County, Sheriff Tom Bosenko said in a Sunday news conference.
He asked for federal assistance, including military aircraft, shelter supplies and water for evacuated residents in Shasta County, where he said the Carr Fire had grown "uncontrollably".
The Sacramento Bee reports that 25-year-old Jade Ball and 19-year-old Jack Fannin, of Redding, were found with what police said was evidence tying them to several burglaries.
The fire has also claimed the lives of two firefighters and two children and their great-grandmother.
Don Ray Smith, a bulldozer operator who died working to contain the fire was identified as an 81-year-old man from a small community east of Sacramento. The weather service notes that "spreading is not driven by the wind, but rather the fire itself", meaning the rising of hot air and gases inside the fire creates a wind that feeds it.
On Saturday, Redding police said they were searching for 17 people still unaccounted for two days afterward. Triple-digit temperatures and dry vegetation are making it hard for crews to corral the blaze.
The fires have spread across 48,000 acres (194 sq km) of land - an area larger than the city of San Francisco. "As this fire was just exploding, it's just been inching closer and closer and closer to the station to the point where there was a neighborhood up in flames just about a mile away from the station, just across from the Sacramento River", Damante said during an interview on "Good Morning America" early Friday.
Authorities on Sunday had not reopened neighborhoods in Redding that were devastated by the flames.
California fire officials say wildfires around the state have forced roughly 50,000 people from their homes.
About 38,000 people were under evacuation orders, 5,000 homes were threatened and the fire was just 5 percent contained. The boy said he had to come back to the home.
Although well above average for the same period over the past decade, it is down from 5.27 million acres (2.13 million hectares) in the first seven months of 2017.
The fire that was ignited Monday in forested hills grew overnight to 127 square miles (328 square kilometers). Despite the efforts of 3,400 active fire personnel, the blaze is winning. And two new blazes burning 30 miles apart are threatening dozens of buildings and have prompted mandatory evacuations in Northern California's Mendocino County.
The Carr fire, the deadliest and most destructive of almost 90 fires burning from Texas to OR, has charred 36,095 hectares of drought-parched vegetation since erupting last Monday.
"We are simply not getting a break", said Chris Anthony, a division chief with the California Department of Forestry and Fire Protection (Cal Fire).
The weather forecast for the south part of the Carr Fire near Igo for Saturday calls for a high of 110 degrees, 11 percent relative humidity, and variable winds at 5 to 10 miles per hour gusting up to 13.
"There's so much smoke up there, it's actually keeping the temperature down by about 10 degrees", Barufaldi said. "It just continues to be really hot, really dry and we continue to get those winds".
Residents who gathered their belongings in haste described a chaotic and congested getaway as the embers blew up to a mile ahead of flames and the fire leaped across the wide Sacramento River and torched subdivisions in Redding, a city of 92,000 about 100 miles south of the OR border.
The latest tally showed at least 517 structures destroyed and another 135 damaged, Romero said.
The fire burned over the operator and his equipment, making him the second bulldozer operator killed in a California blaze in less than two weeks.
Anna Noland, 49, was evacuated twice in three days before learning through video footage Saturday that the house she last saw under dark and windy skies had burned.