The City of Regina is reminding residents to make sure their carbon monoxide detector is working following a fatal incident on Friday.

At 7:54 p.m., Regina Fire & Protective Services responded to a call at the 1800 block of Albert Street regarding two unconscious people inside their building. Officers say one person was transported to hospital in critical condition, while the other was pronounced dead at the scene.

While responding to the call, crews detected dangerous levels of carbon monoxide, prompting the Hazardous Materials Team to attend the scene. Fire crews, working with Gas Inspectors, identified and shut down the source of carbon monoxide, and they are still working to determine the exact cause and nature of the failure.