COMMERCE CITY, Colo. (KKTV) - Nine people were hospitalized after high levels of carbon monoxide seeped into a Denver-area home Wednesday.

South Adams County Fire Department says it was called to the house just before 1 p.m. on reports of a carbon monoxide alarm going off and multiple people who were sick. The home is near 69th and Olive Place in Commerce City.

“Crews detected high levels of carbon monoxide within the residence. The homeowners were evacuated, and nine patients were transported to the hospital for evaluation,” the fire department said.

Citing the fire department, 11 News sister station CBS Denver reports that starting up a furnace may have been what caused the poisonous gas to get into the home.

The conditions of the patients have not been updated as of the time of this

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