A drinking fountain in Cleveland Hopkins International Airport may be the culprit behind a half dozen passengers falling ill on a Cleveland-to-Tampa flight yesterday.

News sources say six people on a Frontier Airlines flight became sick en route to their destination. Health officials boarded the plane when it landed at Tampa International Airport. The six affected passengers – who were not traveling together – were reportedly vomiting during the flight.

The remaining passengers were kept on the plane for about an hour after it landed before being allowed to deplane.

Although there was no immediate confirmation that the drinking fountains at the Cleveland airport were the cause of the illness, officials there shut down several of them out of what one spokesman called “an abundance of caution.”

There’s no word yet on the condition of the passengers who were affected.

Frontier said in a statement that cause of the illness remains under investigation.