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A firefighter with the Timberline Fire Protection District sprays water on a snow-covered home still smoldering from the Marshall Fire in the Rock Creek neighborhood of the town of Superior in Boulder County, Colorado on Jan. 1.JASON CONNOLLY/AFP/Getty Images

Search teams looked for two missing people on Sunday in the snow-covered but still smouldering debris from a massive Colorado wildfire, while people who barely escaped the flames sorted through what was left after the blaze and investigators tried to determine its cause.

The flames ripped through at least 24 square kilometres and left nearly 1,000 homes and other buildings destroyed in suburbs between Denver and Boulder. It came unusually late in the year following an extremely dry fall and amid a winter nearly devoid of snow. Experts say those conditions, along with high winds, helped the fire spread.

In hard-hit Louisville, Susan Hill walked her dog in the well-below freezing chill Sunday morning down a snowy street. She choked up as she remembered three days ago seeing the sky change colour from the hill where she used to watch fireworks – and then the nervous sprint out of town with her college-age son and the dog, cat and the fire box with birth certificates and other documents.

The flames stopped about 90 metres from her property, and she slept Saturday night in her home using a space heater and hot water bottles to stay warm since her natural gas service had not been turned back on.

“I don’t even know how to describe it,” she said. “It’s so sad. It’s so awful. It’s just devastating.”

In the burned-out neighbourhood near Ms. Hill’s home, a U.S. Mail carrier checked the still-standing brick and stone boxes for outgoing mail. The fire came so quickly people might have put bills or other letters in there, and she didn’t want someone to steal them.

While homes that burned to the foundations were still smouldering in some places, the blaze was no longer considered an immediate threat – especially with Saturday’s snow and frigid temperatures.

“A day late and a dollar short,” Ms. Hill said of snow, which scientists said typically prevents winter fires that spread in dry grass.

Authorities initially said everyone was accounted for after the fire. But Boulder County spokesperson Jennifer Churchill said the reports of three people missing were later discovered amid the scramble to manage the emergency. One was found alive, officials said Sunday.

Crews were still looking for a woman at a home in Superior and a man living near Marshall. Boulder County Sheriff Joe Pelle said their homes were “deep in hot debris and covered with snow. It is a difficult task.”

Other investigators were seeing if the missing people might have made it out, but not contacted their families or friends, Mr. Pelle said.

Colorado Governor Jared Polis and federal emergency officials visited some of the damaged neighbourhoods Sunday morning.

“I know this is a hard time in your life if you’ve lost everything or you don’t even know what you lost,” Mr. Polis said after the tour. “A few days ago you were celebrating Christmas at home and hanging your stockings and now home and hearth have been destroyed.”

The cause of the fire is still under investigation. Utility officials found no downed power lines around where the fire broke out.

Mr. Pelle said Saturday authorities were pursuing a number of tips and had executed a search warrant at “one particular location.” The sheriff refused to give details again Sunday, including whether he thought the fire was set.

“It’s complicated and it’s all covered with a foot of snow,” Mr, Pelle said of the scene where the fire started. “The outcome of that investigation is vital – there is so much at stake. We are going to be professional. We are going to be careful.”

Of at least 991 buildings destroyed by the fire, most were homes. But the blaze also burned through eight businesses at a shopping centre in Louisville, including a nail salon and a Subway restaurant. In neighbouring Superior, 12 businesses were damaged, including a Target, Chuck E. Cheese, Tesla dealership, a hotel and the town hall.

The two towns are about 30 kilometres northwest of Denver with a combined population of 34,000.

Utility crews expected to restore electricity to the homes still standing Sunday, but warned gas service might take longer to get back.

People lined up to get donated space heaters, bottled water and blankets at Red Cross shelters. Xcel Energy urged other residents to use fireplaces and wood stoves to stay warm and keep their pipes at home from freezing.

Superior resident Jeff Markley arrived in his truck to pick up a heater. He said he felt lucky to be “just displaced” since his home is intact.

“We’re making do, staying with friends, and upbeat for the new year. Gotta be better than this last one,” Mr. Markley said.

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