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CLEMMONS – About a dozen people were taken to the hospital after showing signs of carbon monoxide poisoning Saturday night at a restaurant in Clemmons.

An off-duty firefighter was at the River Ridge Taphouse at 1480 River Ridge Drive when he noticed signs of carbon monoxide poisoning, Forsyth County EMS told WGHP/FOX8.

Carbon monoxide is a colorless, odorless and tasteless gas, making it hard to detect. Early symptoms of poisoning — headaches, dizziness, nausea and vomiting — can often be written off as flu-related, but health risks can escalate if the problem goes unchecked. Exposure can cause death.

The firefighter reported the incident and firefighters from Lewisville and Forsyth County and EMS responded.

Six ambulances and an ambulance bus responded to the scene. About 32 people showed symptoms of carbon monoxide poisoning and about a dozen were transported.

An equipment malfunction in the building is suspected to be the cause of the incident.