The remains of Element Hotel is surrounded by debris from the Marshall Fire in Louisville, Colo., on Sunday, Jan. 2, 2022. Investigators are still trying to determine what sparked a massive fire in a suburban area near Denver that burned neighborhoods to the ground and destroyed nearly 1,000 homes and other buildings.

LOUISVILLE, Colo. — Search teams looked for two missing people on Sunday in the snow-covered but still smoldering 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 9.4 square miles 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.

Rex and Barba Hickman sifted through the ashes of their Louisville home with their son and his wife.

Their son Austin cut a safe open with a grinding tool to reveal gold and silver coins, melted credit cards, keys and the charred remains of the couple's passports.

They evacuated with their dog, their iPads and the clothes on their back. Rex Hickman said he was heartbroken to see there was nothing left of their home of 23 years.

“There's a numbness that hits you first. You know, kind of like you go into crisis mode. You think about what you can do, what you can't do,” he said. “The real pain is going to sink in over time.”

The couple have to find a rental property and clothes in the short-term, and their insurance company told them Sunday it would take at least two years to rebuild their home.

“We know how fortunate we are,” Rex Hickman said. “We have each other. We have great friends, wonderful family. So many people have got to be suffering much more than we are, and we feel for them.”

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

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.