Those tests showed a lethal level of carbon monoxide, authorities said. Technicians couldn’t find a defect in the furnace that would have sent carbon monoxide into the home. Investigators found that a carbon monoxide detector in the garage had been removed and replaced with a smoke-only detector. The chief said that in cases of intentional carbon monoxide exposure, vehicles are usually found with empty gas tanks. Residents in the adjoining unit had no signs of carbon monoxide sickness, police said.

Source: The Star December 23, 2021 01:34 UTC