Montgomery County, MD – An 18-year-old man was being treated for possible carbon monoxide poisoning after a chain saw was left running in the basement of a Potomac home.

Montgomery County Fire and Rescue Service spokesperson Pete Piringer said EMS units evaluated six occupants of the home at 10 Brent Court in Potomac around 6:30 a.m. Tuesday.

One of the occupants, the 18-year-old, was transported to a local hospital in serious but not life-threatening condition.