Grim search for victims as wildfires grow to size of NYC

A Cal Fire firefighter works on hot spots on a hill in the Oakmont area of Santa Rosa, Calif., Thursday, Oct. 12, 2017. Gusting winds and dry air forecast for Thursday could drive the next wave of devastating wildfires that are already well on their way to becoming the deadliest and most destructive in California history. (AP Photo/Jeff Chiu)
A firefighter walks along the Highway 29 as thick smoke from a wildfire fills the air Thursday, Oct. 12, 2017, near Calistoga, Calif. Officials say progress is being made in some of the largest wildfires burning in Northern California but that the death toll is almost sure to surge. (AP Photo/Jae C. Hong)
Flames leap skyward as a wildfire burns along a ridge Thursday, Oct. 12, 2017, in Sonoma, Calif. Gusting winds and dry air forecast for Thursday could drive the next wave of devastating wildfires that are already on their way to becoming the deadliest and most destructive in California history. (AP Photo/Rich Pedroncelli)
A helicopter drops a load of water on a wildfire Thursday, Oct. 12, 2017, in Sonoma, Calif. Gusting winds and dry air forecast for Thursday could drive the next wave of devastating wildfires that are already on their way to becoming the deadliest and most destructive in California history. (AP Photo/Rich Pedroncelli)
A Cal Fire firefighter works on hot spots on a hill in the Oakmont area of Santa Rosa, Calif., Thursday, Oct. 12, 2017. A forecast for gusty winds and dry air threatened to fan the fires, which are fast becoming the deadliest and most destructive in California history after destroying thousands of homes and businesses. . (AP Photo/Jeff Chiu)
A hand crew works on hot spots on a hill in the Oakmont area of Santa Rosa, Calif., Thursday, Oct. 12, 2017. A forecast for gusty winds and dry air threatened to fan the fires, which are fast becoming the deadliest and most destructive in California history after destroying thousands of homes and businesses. (AP Photo/Jeff Chiu)
FILE - In this Oct. 9, 2017, file photo, flames from a wildfire leap into the air in Napa, Calif. For many residents in the path of one of California's deadliest blazes, talk is of wind direction, evacuations and goodbyes. (AP Photo/Rich Pedroncelli, File)
FILE - In this Oct 10, 2017, file photo, Leonard George sprays down trees in front of his house in the Oakmont area of Santa Rosa, Calif. For many residents in the path of one of California's deadliest blazes, talk is of wind direction, evacuations and goodbyes. (AP Photo/Jeff Chiu, File)
Firefighters put out a hot spot from a wildfire Thursday, Oct. 12, 2017, near Calistoga, Calif. Communities in wildfire-prone Northern California have an array of emergency systems designed to alert residents of danger: text messages, phone calls, emails and tweets. But after days of raging blazes left at least 23 dead, authorities said those methods will be assessed after some residents complained those warnings never got through. (AP Photo/Jae C. Hong)
A firefighter gestures to his colleagues as he walks through thick smoke from a wildfire Thursday, Oct. 12, 2017, near Calistoga, Calif. (AP Photo/Jae C. Hong)
The San Francisco skyline is obscured by smoke and haze from wildfires Thursday, Oct. 12, 2017, in this view from Sausalito, Calif. Gusting winds and dry air forecast for Thursday could drive the next wave of devastating wildfires that are already well on their way to becoming the deadliest and most destructive in California history. (AP Photo/Eric Risberg)

SONOMA, Calif. — Teams with cadaver dogs began a grim search Thursday for more dead in parts of California wine country devastated by wildfires, resorting in some cases to serial numbers stamped on medical implants to identify remains that turned up in the charred ruins.

Many of the flames still burned out of control, and the fires grew to more than 300 square miles (777 square kilometers), an area as large as New York City.

Sonoma and Napa counties endured a fourth day of choking smoke while many residents fled to shelters or camped out on beaches to await word on their homes and loved ones.

A forecast for gusty winds and dry air threatened to fan the fires, which claimed their 29th victim and were fast becoming the deadliest and most destructive in California history.

Some of the state's most historic tourist sites, including Sonoma city and Calistoga in Napa Valley, were ghost towns populated only by fire crews trying to stop the advancing infernos.

Calistoga, known for wine tastings and hot springs, had dozens of firefighters staged at street corners. Ash rained down from the sky and a thick haze covered the ground. Mayor Chris Canning warned that the fires were drawing closer and all of the city's 5,000 residents needed to heed an evacuation order.

"This is a mandatory evacuation. Your presence in Calistoga is not welcome if you are not a first responder," Canning said during a news briefing, explaining that firefighters needed to focus on the blazes and had no time to save people.

A few residents left behind cookies for fire crews with signs reading, "Please save our home!"

Sonoma County Sheriff Robert Giordano said officials were still investigating hundreds of reports of missing people and that recovery teams would begin conducting "targeted searches" for specific residents at their last known addresses.

"We have found bodies almost completely intact, and we have found bodies that were nothing more than ash and bones," the sheriff said.

Some remains have been identified using medical devices uncovered in the scorched heaps that were once homes. Metal implants, such as artificial hips, have ID numbers that helped put names to victims, he said.

Firefighters had reported modest gains, but containment of the flames seemed nowhere in sight.

"We are not out of this emergency. We are not even close to being out of this emergency," Emergency Operations Director Mark Ghilarducci told a news conference.

More than 8,000 firefighters were battling the blazes, and more manpower and equipment was pouring in from around the country and from as far away as Australia, officials said.

Since igniting Sunday in spots across eight counties, the fires have transformed many neighborhoods into wastelands. At least 3,500 homes and businesses have been destroyed and an estimated 25,000 people forced to flee.

The wildfires continued to grow in size. A total count of 22 fires on Wednesday fell to 21 on Thursday because two large fires merged, said state Fire Chief Ken Pimlott.

The challenge of fighting the fires was compounded by the need for more help and the growing fatigue of firefighters who have been working for days.

"We have people that have been on that fire for three days who don't want to leave," said Cal Fire's deputy incident commander in Napa, Barry Biermann. "At some point, you hit a road block."

Fire officials were investigating whether downed power lines or other utility failures could have sparked the fires. It's unclear if downed lines and live wires resulted from the fires or started them, said Janet Upton, a spokeswoman for the California Department of Forestry and Fire Protection.

Hundreds of evacuees fled to beaches far to the north of the fires, some sleeping on the sand on the first night of the blazes.

Since then, authorities have brought tents and sleeping bags and opened public buildings and restaurants to house people seeking refuge in the safety and clean air of the coastal community of Bodega Bay.

Local charities and residents went to Costco to buy supplies for the fleeing families. California Highway Patrol Officer Quintin Shawk took relatives and other evacuees into his home and office, as did many others.

"It's like a refugee camp," at his office, Shawk said.

Community members fed breakfast to some 200 people on the beach alone, and Patricia Ginochio, who owns a restaurant, opened the eatery for 300 more to sleep, she said. The evacuees' arrival was heralded by a long line of headlights heading to beaches.

"The kids were scared," Ginochio said, adding that temperatures by the beach drop dramatically at night. "They were shivering and freezing."

Some lucky evacuees returned to find what they least expected.

Anna Brooner was prepared to find rubble and ashes after fleeing Santa Rosa's devastated Coffey Park neighborhood.

Then she got a call from a friend: "You're not going to believe this." Her home was one of only a handful still standing.

"I swore when I left I was never coming back to this place," Brooner said. "I feel so bad for all the other people. All of us came back thinking we had nothing left."

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Gecker reported from San Francisco. Associated Press writers Olga R. Rodriguez and Andrew Dalton in San Francisco, Jonathan J. Cooper in Santa Rosa and Brian Skoloff in Calistoga contributed to this report.

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Follow the AP's complete wildfire coverage here: https://apnews.com/tag/Wildfires .

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