The Marshall Fire tore through Boulder County on Thursday, December 30, 2021, leveling subdivisions and charring more than 6,000 acres.

The origin of the blaze is still under investigation, but a search warrant was executed at a private property, Boulder County Sheriff Joe Pelle said.

At least 991 homes in Louisville, Superior and unincorporated portions of Boulder County have been lost in the blaze, Pelle added.

After an extreme swing in weather, the areas affected by the fire were covered with several inches of snow by Friday evening.

Homes in Louisville, Colorado, leveled by the wildfire are seen covered in snow on the morning of Sunday, January 2.
Homes in Louisville, Colorado, leveled by the wildfire are seen covered in snow on the morning of Sunday, January 2.
Helen H. Richardson/MediaNews Group/The Denver Post/Getty Images
Louie Delaware embraces his daughter Elise after seeing the remains of their home destroyed by the fire in Louisville on Friday, December, 31.
Louie Delaware embraces his daughter Elise after seeing the remains of their home destroyed by the fire in Louisville on Friday, December, 31.
Jason Connolly/AFP/Getty Images
Bryan Giles holds his cat Chloe in their temporary living quarters at a Red Cross shelter in Lafayette, Colorado, on January 2.
Bryan Giles holds his cat Chloe in their temporary living quarters at a Red Cross shelter in Lafayette, Colorado, on January 2.
Erin Schaff/The New York Times/Redux
Katie and Nick Ferrington survey their home in Boulder County, Colorado, on January 1.
Katie and Nick Ferrington survey their home in Boulder County, Colorado, on January 1.
Erin schaff/The New York Times/Redux
Mike Jones of Boulder, Colorado, recovers his girlfriend's necklace at her home in the Rock Creek neighborhood of Superior on January 1.
Mike Jones of Boulder, Colorado, recovers his girlfriend's necklace at her home in the Rock Creek neighborhood of Superior on January 1.
Jason Connolly/AFP/Getty Images
Steam rises around the snow covered remains of a home in the Rock Creek neighborhood of Superior on January 1.
Steam rises around the snow covered remains of a home in the Rock Creek neighborhood of Superior on January 1.
Jason Connolly/AFP/Getty Images
A fire crew works to put out flames at a home in Louisville on December 31.
A fire crew works to put out flames at a home in Louisville on December 31.
RJ Sangosti/MediaNews Group/The Denver Post/Getty Images
Burned street signs in the Coal Creek Ranch subdivision of Louisville are seen on December 31.
Burned street signs in the Coal Creek Ranch subdivision of Louisville are seen on December 31.
Helen H. Richardson/MediaNews Group/The Denver Post/Getty Images
Holiday decorations stand beside the remains of a deck and home in Louisville on December 31.
Holiday decorations stand beside the remains of a deck and home in Louisville on December 31.
Marc Piscotty/Getty Images
A couple grieves near the location where their house once stood in Louisville on December 31.
A couple grieves near the location where their house once stood in Louisville on December 31.
Carl Glenn Payne/ZUMA Press Wire Service
Fires burn in Superior on Thursday, December 30.
Fires burn in Superior on Thursday, December 30.
Dan Fogarty via Reuters
People deliver donations to the YMCA of Northern Colorado in Layafette, Colorado, on December 30.
People deliver donations to the YMCA of Northern Colorado in Layafette, Colorado, on December 30.
Rachel Woolf/The New York Times/Redux
A home in the Centennial Heights neighborhood of Louisville burns on December 30.
A home in the Centennial Heights neighborhood of Louisville burns on December 30.
Marc Piscotty/Getty Images
An officer directs traffic out of neighborhoods in Superior on December 30.
An officer directs traffic out of neighborhoods in Superior on December 30.
Helen H. Richardson/MediaNews Group/The Denver Post/Getty Images
Firefighters attempt to put out a fire in Superior on December 30.
Firefighters attempt to put out a fire in Superior on December 30.
Trevor Hughes/USA Today Network
A Mountain View fire engine makes its way through traffic in Louisville on December 30.
A Mountain View fire engine makes its way through traffic in Louisville on December 30.
Helen H. Richardson/MediaNews Group/The Denver Post/Getty Images
A person tries to put out fire around a house in Superior on December 30.
A person tries to put out fire around a house in Superior on December 30.
Helen H. Richardson/MediaNews Group/The Denver Post/Getty Images