The fire department says crews had responded to a medical call at a home and were treating a 21-year-old woman Thursday morning when their carbon monoxide monitors sounded an alarm.
A local utility was investigating the source of the gas.
The condition of the four people was not known.
Carbon monoxide is a colorless, odorless, tasteless gas that can cause sudden illness and death. It is found in combustion fumes. Common symptoms of poisoning include headache, dizziness, weakness, nausea and confusion.
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