A carbon monoxide incident in a Kansas hotel caused by a swimming pool heater sent two guests to the hospital.

The DoubleTree by Hilton in Riley County was evacuated on the morning of May 17 by fire crews responding to an unknown hazmat situation. The Manhattan Fire Department found elevated levels of carbon monoxide inside the hotel.

Riley County EMS transported two hotel guests to Ascension Via Christi Hospital and evaluated other guests at the scene. A total of 12 firefighters responded to the incident. After ventilating the building, the last units cleared at 3 p.m. when guests were allowed to return inside.

The cause of the carbon monoxide incident was determined to be the pool heater and inoperable exhaust fans for the heating system.

Image credit: DoubleTree by Hilton in Riley County