Passengers on a Frontier Airlines flight bound for Tampa, Florida were stuck on the tarmac for more than an hour after six people fell ill while on board the flight.

According to WFLA-TV, six of the 226 total passengers on Frontier Flight 397 fell ill at some point during the flight between Cleveland and Tampa. When the plane landed at Tampa International Airport at around 3:30 p.m. Tuesday afternoon, health officials reportedly wearing masks boarded the plane and removed the sick passengers.

The six passengers were briefly held for observation and later released. They were not taken to any hospitals, officials said.

The remaining passengers were held on board for about an hour before they were able to deplane at around 4:30 p.m. ET.

A spokesperson for the airport in Cleveland say it's possible the illnesses were connected to a drinking fountain. The drinking fountains in the Frontier concour at Cleveland International Airport were shut down out of caution.

Frontier Airlines released a statement regarding the flight on Tuesday evening.

"During Frontier flight 1397 from Cleveland to Tampa this afternoon, six passengers became ill. The aircraft was met by local emergency medical services upon arrival in Tampa. Those passengers displaying symptoms were evaluated by medical staff before being released. All other passengers were released after a brief holding period. The cause of the illness remains under investigation. Passenger safety is Frontier’s number one priority."

No further details were immediately available.

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