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(KSL News) -- Park City authorities are investigating a possible hazardous spill.
Workers at a Marriott Hotel first noticed a strange odor, and called authorities.
Hazmat crews found a toxic, irritating chemical in the air, but they're not sure what it is.
Tricia Hurd/Park City Fire Dept.: "There's a possibility it could just be cleaning agents that are mixed with some other chemicals. Again, we have not confirmed that, so we're just trying to keep everybody away. Safety is our primary concern."
They say the chemical is isolated to a single area. Crews closed several blocks, including part of Main Street, to test the air, but didn't call for any evacuations.
Five workers were treated for burning eyes and scratchy throats.
