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A Delta Airlines flight was diverted to Tulsa International Airport after multiple passengers fell ill at the same time. Flight 1817 was traveling to Denver from Atlanta on Saturday when it was diverted at around 3pm. Tulsa Fire Department said elevated levels of carbon monoxide was found in the bodies of some of the passengers, according to ABC News. The cause of the higher levels has not yet been determined but an investigation continues.

Initially it was reported that nine flyers felt ill and were complaining of nausea and sickness but fire department spokesman Stan May later said it was actually 12. May said that once passengers had got some fresh air, their levels returned to normal. Mel Gillen, one of the passengers on board, told Fox News that people 'put their head down because they were feeling so nauseous' and some had also vomited.

Emergency Medical Services Authority spokeswoman Kelli Bruer said one passenger was taken to the hospital as 'non-emergent'. Another passenger was taken to a hospital for unrelated medical issues according to Bruer.

The airline says 152 passengers were on board the plane when its crew decided to divert to Tulsa after 'a few' passengers reported feeling ill. A second plane was sent to Tulsa to take the passengers on to Denver on Saturday evening. Passengers were being re-screened at about 8.30pm local time to get them on another Denver-bound plane.