RedactedNarrative: CPO responded to a call at the Grafton Marina on the IL River. CPO was informed 2 subjects were injured due to possible carbon monoxide poisoning. When CPO arrived at marina, the initial emergency personnel who responded had just left. The 2 injured victims were flown by Arch air support to hospitals in St. Louis, MO. CPO met with the owner of the boat, who was aboard when the incident occurred. CPO asked him what had happened. 
  
  Owner stated his 2 friends were in the cabin with him. He stated the male subject, Victim1, just collapsed. He stated the female subject also collapsed. He stated he was able to get out of the boat to call 911. He explained that due to past medical issues, he was not able to carry either victim out of the boat. He waited for EMS to arrive, and directed them as to what had occurred. Owner stated he was getting the vessel repaired that day because he was aware of a possible carbon monoxide issue with the boat. 
  
  Owner stated that mechanics from Port Charles marina had just left 20 minutes before the incident occurred. They were initially taken to 2 different hospitals, but both ended up at St. Lukes Hospital in Chesterfield, MO. CPO contacted this hospital and was informed at that time they were in stable condition. CPO''s arrived as members of the BAT team to further investigate the incident. Investigation pending by IL Conservation Police BAT team at this time.  There was an exhaust leak into the cabin from an undetermined location.