Sanbornton, NH – Authorities said a furnace malfunction caused a carbon monoxide scare in Sanbornton Saturday evening.
Fire crews were responding to a medical call, and when they walked inside the carbon monoxide detectors they were carrying went off.
Officials said the home had extremely high levels of CO2.
Two people were taken to the hospital, and one had serious exposure.
Officials said the home did not have working carbon monoxide detectors.