O’Fallon firefighters were called to a report of a fire Tuesday morning at the Drury Inn in O’Fallon, but they found no fire.
Fire officials said a malfunctioning heating system apparently set off smoke detectors.
Occupants were evacuated, but quickly allowed to return to their rooms.
Emergency radio transmissions indicated there was smoke seen at the hotel.
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Firefighters were called shortly after 9 a.m.