Hampton Inn

A follow-up investigation into the Marysville Hampton Inn where several people suffered carbon monoxide poisoning found an expired building permit and cited the hotel.

A pool heater is thought to be the cause of a carbon monoxide leak that made more than a dozen people sick, including six children.

Authorities are trying to find the source of carbon monoxide after 11 people, more than half of them children, were taken to the hospital from a Hampton Inn in Ohio.