A Delta Airlines flight was diverted to Tulsa International Airport after as many as a dozen passengers said they got sick around the same time.

Delta Airlines flight 1817 was traveling to Denver from Atlanta on Saturday when it diverted to Tulsa at about 3 p.m.

Up to 12 pets complained or showed signs of carbon monoxide poisoning, Tulsa Fire Captain Stan May told KJRH.

Emergency Medical Services Authority spokeswoman Kelli Bruer said responders with the ambulance service treated nine passengers suffering similar symptoms, including nausea. Bruer says one passenger was taken to the hospital as "non-emergent."

Bruer says another passenger was taken to a hospital for unrelated medical issues.

The airline said 152 passengers were on board the plane when its crew decided to divert to Tulsa after "a few" passengers reported feeling ill.

The Associated Press contributed to this report.