Carbon monoxide is being blamed for injuring at least one person at Leamington Church, according to OPP.
Essex Windsor Emergency Medical Services and Leamington Fire Services arrived at the Seventh Day Adventist Church on Erie St. at around 2pm Saturday after a report of a man with chest pain.
First responders later confirmed the presence of carbon monoxide.
Police are asking anyone who attended the church Saturday to see a medical professional.
The Ministry of Labour has been contacted, but police haven't confirmed if the man is an employee of the church.