Seven people are in hospital in a critical condition after a suspected carbon monoxide poisoning at a hotel, it has been reported.
A two-year-old girl was found unconscious in a pool at Hampton Inn hotel in Marysville, while others fell seriously ill after being overcome by the deadly gas.
The first 911 call came around 5.30pm local time, Marysville Police Chief Tony Brooks said.
Emergency calls were made to police and ambulance services, with people reporting they felt dizzy or had a burning sensation in their throats.
The hotel was evacuated as emergency services rushed to the scene and the Marysville Fire and Police Departments are working to identify what happened.
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Everyone was alive when they were transported to the hospital but their current conditions are not yet known, Chief Brooks said.
Two more people took themselves to hospital, but are not believed to be in a serious condition, it is understood.
The ages of those affected are not currently known.
Chief Brooks added that whether there was a chemical in the pool area or a carbon monoxide leak is still under investigation.
The updated conditions or ages of those affected has yet to be released at this time.
According to a tweet from Ohio-based journalist Mike McCarthy, a multitude of people received medical care on the scene.
He wrote on Twitter: "At least 16 people have received medical care. 7 people are in critical condition. 2 people were treated at the scene. Others are in stable condition or were walk-in patients at Memorial Hospital."
