At least four people got sick and one was in critical condition after a carbon dioxide leak at Los Angeles International Airport (LAX).
A popping noise reportedly sounded in a utility room at the airport.
The incident was reported around 7am in the Terminal 8 baggage area, stated the fire department.
All four patients were workers.
A 36-year-old man was found not breaking and without a pulse inside the utility room, according to Fire Capt Erik Scott. Airport police administered CPR on him.